We were swimming in the lake _____ sudde...

We were swimming in the lake _____ suddenly the storm started.

A．when

B．while

C．until

D．before

A 【解析】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。考点：考查固定句型

考点分析：

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