题目内容
We were swimming in the lake _______ suddenly the storm started.
| A．until | B．while | C．when | D．Before |
C
解析试题分析：A. Until直到;B. while 当……时候;C. when 这时;D. Before在……之前；根据句意; 我们正在湖里游泳，这时突然暴风雨开始了。根据句意故选C
考点：考查连词的辨析。
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