We were swimming in the lake _____ suddenly the storm started.
A．when B．whileC．untilD．before
A

試題分析：考查固定句型。固定句型:be doing sth when…正在做某事在這時…when后面的句子指發(fā)生了意料之外的事情。When是一個并列連詞，意為“在這時”。句意：我們正在湖里游泳，在這時突然下起了大暴雨。故A正確。
點(diǎn)評：。固定句型:be doing sth when…正在做某事在這時…when后面的句子指發(fā)生了意料之外的事情。When是一個并列連詞，意為“在這時”
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