environmental damage is done, it does take many years for the ecosystem to recover. A. Even if B. Wh——青夏教育精英家教网—

题目内容

_____ environmental damage is done, it does take many years for the ecosystem to recover.

A. Even if
B. While
C. Only if
D. Once

试题答案

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_____ environmental damage is done does it take many years for the ecosystem to recover.

A. Even if B. While C. Only if D. Once

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