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

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

【答案】C

【解析】

試題分析：句意：我們正在湖里游泳，正在這時(shí)突然下起暴風(fēng)雨。until直到；while當(dāng)……時(shí)候，引導(dǎo)的時(shí)間狀語(yǔ)從句中謂語(yǔ)用持續(xù)性動(dòng)詞；when當(dāng)......時(shí)候，引導(dǎo)的時(shí)間狀語(yǔ)從句用短暫性動(dòng)詞；before在……之前。根據(jù)suddenly可知此處表示正在這時(shí)，又根據(jù)動(dòng)詞start是短暫性動(dòng)詞，故用連詞when。故選C。

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