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

A. Even if
B. While
C. Only if
D. Once
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科目：高中英語 來源：0104 期中題 題型：單選題

_____ environmental damage is done, it does take many years for the ecosystem to recover.
[     ]
A. Even if
B. While
C. Only if
D. Once

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科目：高中英語 來源： 題型：

_____ 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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