The rivers will become dirtier and dirtier we take action to protect them. A. since B. if C. until D. unless 16 题目和参考答案——青夏教育精英家教网—

题目内容

13. The rivers will become dirtier and dirtier

we take action to protect them.

A. since B. if C. until D. unless 16

13. D考查连词辨析。

since自从;if如果;until 直到为止；unless 除非(=if not)

句意：如果我们不采取措施保护河流，它们将变得越来越脏。故选 D

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