such heavy pollution already, It may now be too late to clean up the riv_刷题宝

题干

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

A．Suffering.

B．Having suffered.

C．To suffer.

D．Suffered.

上一题下一题 0.64难度单项选择更新时间:2014-11-08 07:22:26

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