---We've seen many more days of blue skies recently. ---True. But back in 1998, ________ Beijing started its “Defending the Blue Sky”program, the city only ________ about 100 days a year.　　

试卷相关题目

• 1___________ she will go or not doesn't matter much

  A.When

  B.That

  C.If

  D.Whether

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• 2I cannot hear the professor clearly as there is too much noise ________ I am sitting

  A.before

  B.until

  C.unless

  D.where

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• 3It was three years_______ he came back

  A.that

  B.since

  C.before

  D.when

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• 4--- Tom, wait a minute. --- What for? --- Take an umbrella ______ it rains.

  A.in order that

  B.so that

  C.in case

  D.as if

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• 5We must do the experiment carefully__________Miss Liu told us.

  A.what

  B.since

  C.as

  D.while

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• 6He has been talented at designing and creating things ________ he was young

  A.when

  B.before

  C.since

  D.while

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• 7It is many years ______ we enjoyed ourselves on the great occasion.

  A.since

  B.that

  C.before

  D.when

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• 8It was in 1969 ___ the American astronauts first succeeded in landing on the moon

  A.that

  B.when

  C.which

  D.in which

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• 9---Did you wait for him long? ---No, I hadn't waited long ______ he appeared.

  A.unless

  B.until

  C.before

  D.since

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• 10Will you pass me the dictionary _____ the cover is dark blue?

  A.its

  B.which

  C.whose

  D.of which

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