摘要： environmental damage is done, it takes many years for the ecosystem to recover. A. Even if B. If only C. While D. Once
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_____ environmental damage is done, it takes many years for the ecosystem (生态系统) to recover.
[ ]
A. Even if
B. If only
C. While
D. Once
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B. If only
C. While
D. Once
_______ environmental damage is done, it takes many years for the ecosystem (生态系统) to recover.
A. Even if B. If only C. While D. Once
查看习题详情和答案>>________ environmental damage is done, it takes many years for the ecosystem(生态系统)to recover．
[ ]
A．Even if
B．If only
C．While
D．Once