_____ environmental damage is done, it does take many years for the ecosystem to recover. |
A. Even if B. While C. Only if D. Once |
科目:高中英语 来源:0104 期中题 题型:单选题
科目:高中英语 来源: 题型:
_____ 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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