题目内容
Small sailboats can easily turn over in the water ______ they are not managed carefully.
| A.though | B.before | C.until | D.if |
D。
由语境逻辑可知,没有被小心驾驶是帆船在水中容易倾覆的条件,因此该空应填if引导条件状语从句。
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题目内容
| A.though | B.before | C.until | D.if |