Small sailboats can easily turn over in the water ______ they are not managed carefully.
A．thoughB．beforeC．untilD．if
D。
由語境邏輯可知，沒有被小心駕駛是帆船在水中容易傾覆的條件，因此該空應(yīng)填if引導(dǎo)條件狀語從句。
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