— How long do you think it will be _____ China sends a manned spaceship to the moon? — Perhaps two or three years.

试卷相关题目

• 1The school rules state that no child shall be allowed out of the school during the day, _____ accompanied by an adult.

  A.once

  B.when

  C.if

  D.unless

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• 2As it reported, it is 100 years _____ Qinghua University was founded.

  A.when

  B.before

  C.after

  D.since

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• 3It never occurred to humans until the mid-1990s _____ some animals can be cloned.

  A.where

  B.that

  C.when

  D.what

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• 4— Haven't seen Lucy recently, what's happened? 一 Oh, it's more than two months _____ she worked here.

  A.which

  B.that

  C.before

  D.since

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• 5_____ I accept that he is not perfect, I do actually like the person.

  A.While

  B.Since

  C.Before

  D.Unless

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• 6Last month I came to Britain. My English has improved a lot _____ I use it all the time.

  A.since

  B.while

  C.when

  D.as

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• 7____ most of the earth's surface is covered by water, fresh water is very rare and precious.

  A.As

  B.Once

  C.If

  D.Although

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• 8It will be some time _____ we know the full results.

  A.if

  B.since

  C.when

  D.before

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• 9You'd better take an umbrella with you _____ it rains.

  A.for

  B.because

  C.in case

  D.since

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• 10_____ I could say a word, she had stormed out of the room.

  A.Before

  B.When

  C.After

  D.Until

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