题目内容

We were swimming in the lake _____ suddenly the storm started.
A．when B．whileC．untilD．before
A

试题分析：考查固定句型。固定句型:be doing sth when…正在做某事在这时…when后面的句子指发生了意料之外的事情。When是一个并列连词，意为“在这时”。句意：我们正在湖里游泳，在这时突然下起了大暴雨。故A正确。
点评：。固定句型:be doing sth when…正在做某事在这时…when后面的句子指发生了意料之外的事情。When是一个并列连词，意为“在这时”
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