We were swimming in the lake ____ suddenly the storm started. (2004北京春招)

A. when  B. while  C. until  D. before

 


参考答案:

A

 

"when" 作连词,表示“正在这时”。意为“我正在湖中游泳,突然暴风雨来了。”只有when才能用于这种句型

 

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