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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

A


解析:

句意為“這條河已經(jīng)遭受如此嚴(yán)重的污染,現(xiàn)在要想清理也許為時(shí)已晚了”。suffer 發(fā)生在 clean up 之前,且有 already 暗示,無疑要用現(xiàn)在分詞的完成式作狀語。

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