Scientists also have no idea how long it will be before all wild animals in the cages _____.

试卷相关题目

• 1—Why didn't you answer the phone when I called you last night? —Sorry, I __________ a bath upstairs.

  A.am having

  B.have

  C.was having

  D.had

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• 2My father and my mother have been married for 30 years, and never once ______ with each other.

  A.they have quarrelled

  B.did they quarrel

  C.had they quarrelled

  D.have they quarrelled

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• 3—Tony, you must have noticed the student who broke the window. —I'm sorry. I _______ attentively.

  A.studied

  B.was studying

  C.am studying

  D.would study

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• 4If their marketing plans succeed，they ________ their sales by 20 percent.

  A.will increase

  B.have been increasing

  C.have increased

  D.would be increasing

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• 5Two building workers got seriously wounded when the stadium _______.

  A.was built

  B.was being built

  C.built

  D.is being built

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• 6-What's the matter? -The cook _____five minutes ago, and there are fifty dinners still to cook.

  A.left

  B.leaves

  C.has left

  D.was leaving

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• 7It's reported that many a house ________ by the heavy snow so far in New York.

  A.have been destroyed

  B.has been destroyed

  C.was destroyed

  D.were destroyed

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• 8The project alongside with the experiment we had once devoted so much time ______ perfectly.

  A.to work out

  B.to working out

  C.to worked out

  D.has worked out

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• 9Most of us_________more than one thousand English words before we came to this school.

  A.would learn

  B.will learn

  C.have learned

  D.had learned

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• 10If we __________earlier, we couldn't be waiting here in a queue.

  A.have started

  B.started

  C.start

  D.had started

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