题目内容
7.____ such heavy pollution already,it may now be too late to clean up the lake.( )A. | Suffering | B. | Having suffered | C. | To suffer | D. | Suffered |
分析 已经遭受了如此严重的污染,现在清理干净这个湖泊可能有点太晚了.
解答 答案B 本题考查非谓语.suffer的逻辑主语为 the river,两者构成主动关系;又 already 表示动作已经发生,是完成时的标志,只有B项符合题意,故正确答案为B.
点评 本题属于非谓语动词的考查,应该学会先判断语态,根据非谓语动词与逻辑主语间的主被动关系可以排除部分干扰项;再根据时态排除部分干扰项,从而可以得出正确选项.

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