The world’s (remained) tropical forests (are being destroyed) so fast that, (at) current trends, by the middle of this century o

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问题 The world’s (remained) tropical forests (are being destroyed) so fast that, (at) current trends, by the middle of this century only (the most inaccessible) will remain.

选项 A、remained
B、are being destroyed
C、at
D、the most inaccessible

答案A

解析 remain一词只能用主动语态。
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