2. 外语
  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.

admin2012-05-08  69
问题 ______ such heavy pollution already, it may now be too late to clean up the river.
选项 A、Suffering
B、Suffered
C、To suffer
D、Having suffered
答案D
解析
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