The rivers will become dirtier and dirtier we take action to protect them.A．sinceB．ifC．untilD．unless 题目和参考答案——青夏教育精英家教网——

题目内容

The rivers will become dirtier and dirtier ______ we take action to protect them.

A．since

B．if

C．until

D．unless

D

since由于，自从……以来；if 是否，如果； until直到；unless除非，如果不。句意：如果我们不采取措施保护他们，这些河流会越来越脏。结合语境可知选D。

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