___________  rockets had been used sporadically for several hundred years, they remained a relativelyminor artifact of civilization until the twentieth century.

试卷相关题目

• 1They are sweating all over. They __________  in the field.

  A.may be

  B.must have been working

  C.could be

  D.must having been working

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• 2Which of the following is a dynamic verb (动态动词）？

  A.Believe.

  B.Feel.

  C.Consider.

  D.Mov

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• 3Which of the following is INCORRECT?

  A.The number of bread.

  B.A bit of water.

  C.Such men.

  D.Other coal.

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• 4Which of the following sentences expresses a future action?

  A.Karl is continually finding fault with his classmates.

  B.We are leaving Seattle next week.

  C.The boy is now trying on a new shirt.

  D.I’m hoping that you’ll come back soon.

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• 5The floor ___________  wet and slippery, we stayed outside.

  A.to be

  B.been

  C.being

  D.be

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