2. 专升本
  3. ______ such heavy pollution already, it may now be too late to clean up the river.

______ such heavy pollution already, it may now be too late to clean up the river.

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问题 ______ such heavy pollution already, it may now be too late to clean up the river.
选项 A、Having suffered
B、Suffering
C、To suffer
D、Suffered
答案A
解析
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