高考英语连词练习15

试卷预览

• 21____ 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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• 22The American Civil War lasted four years ________ the North won in the end.

  A.after

  B.before

  C.when

  D.then

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• 23_____ I prefer a color TV, I have to buy a black and white one this time.

  A.As

  B.Since

  C.Because

  D.Although

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• 24— 'How long do you suppose it is _______ he left for Japan?' — 'No more than half a month.' 

  A.when

  B.before

  C.after

  D.since

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• 25There is a widespread belief among the science world ____ we keep on _____  the earth as we are doing today, the existence of us humans on this planet will be out of the question in some years yet to come.

  A.if; polluting

  B.if; to pollute

  C.that if; to pollute

  D.that if; polluting

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• 26I'm sorry you've been waiting so long, but it'll still be some time ______ Brian gets back.

  A.before

  B.since

  C.till

  D.after

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• 27It helps ________ you pay attention to the social skills.

  A.when

  B.before

  C.the moment

  D.if

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• 28Do you know how long it is ______we last went to the theatre?

  A.since

  B.before

  C.when

  D.that

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• 29It will be worth trying _____it should not succeed at once .

  A.as if

  B.even though

  C.now that

  D.as long as

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• 30______the Internet is of great help, I don't think it's a food idea to spend too much time on it.

  A.If

  B.While

  C.Because

  D.As

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