题目内容

22、Small sailboats can easily torn over in the water            they are not managed carefully.

A．though

B．before

C．until

D．if

试题答案

22、 D

 解析：  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。