We were swimming in the lake ______

试题详情及答案解析

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

A．until

B．while

C．when

D．Before

答案：C

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。