The boy was so tired that he fell asleep ______ his mother could take off his cl

The boy was so tired that he fell asleep ______ his mother could take off his cl

题型:不详难度:来源:
The boy was so tired that he fell asleep ______ his mother could take off his clothes.
A.beforeB.afterC.whileD.when

答案
A
解析
句意:这个小男孩如此的累以至于他的母亲还没来的及给他脱衣服他就睡着了。before 作为还没来得及之意时,常与情态动词could 连用。故选A。
举一反三
It was 1920 ______ regular radio broadcasts began.
A.whileB.whenC.thatD.since

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A.IfB.UnlessC.WhenD.Since

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Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.
A.whenB.afterC.beforeD.since

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He looks so weak and pale ________ suffering from a serious illness.
A.as ifB.as long asC.now thatD.even if

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There is no doubt _________ the world climate has been changing in recent years.
A.thatB.whatC.ifD.whether

题型:不详难度:| 查看答案
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