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

試題分析：考查連詞：句意：我們正在湖里游泳這時突然下雨了。當(dāng)一個動作正在、已經(jīng)或即將發(fā)生時，突然出現(xiàn)了一個預(yù)料不到的動作，這個預(yù)料不到的動作要用并列連詞when引導(dǎo)，when的意思是“這時”，“就在這時”. B. while當(dāng)…時候，表示“一段時間”，C.  until直到，D. before在…前面，答案為A.
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