[题目]We were swimming in the lake suddenly the storm started.A. until B. while C. when D. before 题目和参考答案——青夏教育精英家教网—

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

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

【答案】C

【解析】

试题分析：句意：我们正在湖里游泳，正在这时突然下起暴风雨。until直到；while当……时候，引导的时间状语从句中谓语用持续性动词；when当......时候，引导的时间状语从句用短暂性动词；before在……之前。根据suddenly可知此处表示正在这时，又根据动词start是短暂性动词，故用连词when。故选C。

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