问题
选择题
_______such heavy pollution already, it may now be too late to clean up the river.[ ]
A. Having suffered
B. Suffering
C. To suffer
D. Suffered
答案
答案：A
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_______such heavy pollution already, it may now be too late to clean up the river.[ ]
A. Having suffered
B. Suffering
C. To suffer
D. Suffered
答案：A