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Small sailboats can easily turn over in the water ______ they are not managed carefully.

   A. though  B. before C. until   D. if

D


解析:

状语从句连词的选用。根据前后句的逻辑关系,空格内应填if引导条

件状语从句。句意:“小帆船如果不小心驾驶,也会容易翻。

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