题目内容

We were swimming in the lake _______ suddenly it began to rain heavily.
A． when B． whileC． untilD．before
A

试题分析：考查连词：句意：我们正在湖里游泳这时突然下雨了。当一个动作正在、已经或即将发生时，突然出现了一个预料不到的动作，这个预料不到的动作要用并列连词when引导，when的意思是“这时”，“就在这时”. B. while当…时候，表示“一段时间”，C.  until直到，D. before在…前面，答案为A.
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