______ we know some basic knowledge concerning AIDS, we can protect ourselves from being infected.

试卷相关题目

• 1——Have you got the results of the final exam? ——Not yet. I'm afraid it will be a few days ______ we know the final results.

  A.before

  B.after

  C.until

  D.when

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• 2 ______ you know your potential, you have to rely on many other people to get to where you are.

  A.Since

  B.If

  C.While

  D.Once

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• 3You know, the weather is not very good. Is there any possibility ______ the flight would be put off?

  A.whether

  B.when

  C.why

  D.that

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• 4Perseverance is a kind of quality, and that's ______ it takes to do anything well.

  A.what

  B.that

  C.when

  D.why

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• 5In the earthquake, parents were willing to do ______ they could ______ their children.

  A.whatever; save

  B.whatever; to save

  C.what; saving

  D.what; to save

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• 6Her father is a famous writer, ______ always makes her very proud.

  A.that

  B.which

  C.who

  D.what

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• 7Many experts hold the view ______ teacher development is ______ the key to better education lies.

  A.which; where

  B.which; in which

  C.that;where

  D.that;in which

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• 8You should be careful of such a person ______ flatters you in your presence and speaks ill of you in behind.

  A.who

  B.that

  C.as

  D.which

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• 9No one knows exactly ______ this important discovery was made.

  A.that　　　

  B.that how 　　

  C.what 　　

  D.when

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• 10— How long is it ______ you picked up your badminton training? — It was not until my finance became better in last December ______ I started the training.

  A.before; when

  B.until; that

  C.that; when

  D.since; that

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