Dr Yuan Longping grows ________ is called super hybrid rice, _________ has a high output.

试卷相关题目

• 1It will be at least three weeks________ he recovers from his illness and returns to work.

  A.before

  B.when

  C.since

  D.after

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• 2I was about to give up the project ______ it hit me_____ I could work with my roommates. That's to say, I can turn to them for help.

  A.that; whether

  B.that; when

  C.when; how

  D.when; that

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• 3Scientists say it may be five years ______ it is possible to test this medicine on human patients．

  A.since

  B.until

  C.before

  D.when

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• 4The woman was about to open the door _______ she heard a strange sound from inside.

  A.as

  B.while

  C.when

  D.then

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• 5_____ earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate.

  A.As

  B.While

  C.Because

  D.If

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