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They were about to leave       it began to rain.
A.beforeB.durningC.whileD.when
D

试题分析:考查连词。be about to do sth...when...,正要做某事的时候,这时(突然)...。A.before在...之前,趁...还未,不等...就  B.durning在...期间  C.while 当...的时候,尽管 D.when当...的时候,这时(突然)。句意:他们正要离开时,天开始下雨。
点评:本题要注意特殊句型结构:be about to do sth...when...,正要做某事的时候,这时(突然)...。类似的还有:be doing sth...when...,正在做某事的时候,这时(突然)...。
即学即练:I was about to get out the room       the door was opened .
A.when      B.while     C.before    D.as
选A
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