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They were swimming in the river suddenly the storm started. A. when B. while C.

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They were swimming in the river suddenly the storm started. A. when B. while C.

They were swimming in the river ______ suddenly the storm started.

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

试题答案

       A  

解析:

       题意:他们正在河里游泳,就在那时来了暴风雨。when 连词,意为“就在这时/ 这时”,相当于at the time when.