We were swimming in the lake ________ suddenly the storm started.
A.whenB.whileC.untilD.before在线课程A
解析:
本题意为“我们正在湖里游泳,这时突然刮起了风暴。”when引导时间状语从句时,表示“在……时候”;
也可以引导定语从句,此外还可用做并列连词,表示“就在这时/那时。”while既可引导时间状语,也可以做连词,意为“而,然而”;
until意为“直到……”;
before意为“在……之前。”这二者都只引导时间状语。
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