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

试题分析:考查固定句型。固定句型:be doing sth when…正在做某事在这时…when后面的句子指发生了意料之外的事情。When是一个并列连词,意为“在这时”。句意:我们正在湖里游泳,在这时突然下起了大暴雨。故A正确。
点评:。固定句型:be doing sth when…正在做某事在这时…when后面的句子指发生了意料之外的事情。When是一个并列连词,意为“在这时”
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