（2007湖南）Most brids find it safe to sleep in the trees, but ______  they have eggs or young chicks, they don’t use a nest.

试卷相关题目

• 1（2007辽宁）We had to wait half an hour______we had already booked a table.

  A.since

  B.although

  C.until

  D.before

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• 2（2007江西）He was told that it would be at least three more months______he could recover and return to work.

  A.when

  B.before

  C.since

  D.that

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• 3（2007安徽）The field research will take Joan and Paul about five months; it will be a long time ______we meet them again.

  A.after

  B.before

  C.since

  D.when

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• 4（2007天津）It is difficult for us to learn a lesson in life______we’ve actually had that lesson.

  A.until

  B.after

  C.since

  D.when

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• 5（2007上海）Small sailboats can easily turn over in the water______they are not managed carefully.

  A.though

  B.before

  C.until

  D.if

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• 6（2007陕西）—______when has the country been open to international trade、—1978, I suppose.

  A.Since

  B.In

  C.From

  D.After

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• 7（2007重庆）My parents live in a small village.They always keep candles in the house    ______there is a power out.

  A.if

  B.unless

  C.in case

  D.so that

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• 8（2007浙江）Many of them turned a deaf ear to his advice, ______they knew it to be valuable.

  A.as if

  B.now that

  C.even though

  D.so that

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• 9（2007山东）    ______I really don’t like art, I find his work impressive.

  A.As

  B.Since

  C.If

  D.While

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• 10（2006全国Ⅰ）______he has limited technical knowledge, the old worker has a lot of experience.

  A.Since

  B.Unless

  C.As

  D.Although

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