We were swimming in the lake suddenly the storm started.A. until B. while C. when D. before

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【题目】We were swimming in the lake ______ suddenly the storm started.

A. until B. while C. when D. before

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【答案】C

【解析】

试题分析：考查固定句型。句意：我们正在湖里游泳，在这时突然下起了大暴雨，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，故选C项。