We were swimming in the lake suddenly the storm started.

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问题 We were swimming in the lake suddenly the storm started.

选项 A、when
B、while
C、until
D、before

答案A

解析本句意为：我们正在湖里游泳，这时暴风雨来了。根据句式“…was//were doing…when…”，表示“正在做…，这时…”。

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