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We were swimming in the lake ________ suddenly the storm sta

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We were swimming in the lake ________ suddenly the storm started.
A. when
B. while
C. until
D. before
We were swimming in the lake ________ suddenly the storm sta
答案A
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.