题目内容
They were about to leave it began to rain.
| A．before | B．durning | C．while | D．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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