独立主格结构练习题
1. A new technique _______, the yields as a whole increased by 20 percent.    A)working out  C) having been worked out
B) having worked out  D)to have been worked out
2.  All things _______, the planned trip will have to be called off. A) considered B) be considered C) considering D) having considered
3. All flights _______ because of the snowstorm, many passengers could do nothing but take the train.    A) had been canceled  B) have been canceled 
C) were canceled  D) having been canceled
4. So many directors _______, the board meeting had to be put off.
A) were absent B) been absent C) had been absent D) being absent
5. All the tasks _______ ahead of time, they decided to go on holiday for a week.
A) been fulfilled  B) having been fulfilled  C) were fulfilled  D) had been fulfilled
6.. The meeting____ over, we all left the room. （上海1987）
A. is    B. to be    C. being    D. would be
7.The speech _______, a lively discussion started.
A) being delivered B) was delivered  C) be delivered D) having been delivered
8. Silver is the best conductor of electricity, copper _______ it closely.
A)followed B) following C) to follow D)being following
9. _______, a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of language is poor.
A) Other things being equal C) To be equal to other things
B) Were other things equal D) Other things to be equal
for the sale
10. The sale usually takes place outside the house, with the audience _______ on benches，chairs or boxes.A) having seated
B) seating    C) seated    D) having been seated
11. _______ the temperature falling so rapidly, we couldn't go on with the experiment.  A) Since B) For C) As D) With
12. _______ in the United States, St. Louis has now become the 24th largest city.
A) being the fourth biggest city B) It was once the fourth biggest city
C) Once the fourth biggest city D) The fourth biggest city it was
13. ___such heavy pollution already, it may now be too late to clean up the river. 
A. Having suffered      B. Suffering    C. To suffer    D. Suffered
14. The fish____ bad, the children left much of it .
  A. tasted, untouched    B. tasting, untouched
  C. tasting, untouching      D. tasted, untouching
15.___ from what you say, he ought to succeed.
  A. Judged    B. Judging    C. When you judged    D. Because you judge
16. Everything___ into consideration, they ought to have another chance.
A. to take    B. taken    C. to be taken    D. taking
17.Walter offered us a lift when he was leaving the office, but our work ______, we didn’t accept the offer.
A.not being finished    B.not having finished 
    C.had not been finished    D.was not finished
18.There are various kinds of metals, each ______ its own properties (特性).
A.has    B.had    C.to have    D.having
19.The old man stood under a big tree, ______.
A.a pipe in mouth  B.with a pipe in mouth  C.pipe in mouth  D.pipe in his mouth
20.The production ______ steadily, the factory needs an ever-increasing supply of raw material.
A.has gone up    B.is going up    C.having gone up    D.being gone up
Keys;  1-----5 CADDB  6---10 CDBAC  11---15 DCABB  16---20 BADCC

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