问题
选择题
Small sailboats can easily turn over in the water ______ they are not managed carefully.
A．though
B．before
C．until
D．if
答案
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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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。