such heavy pollution already, it may now be too late to clean up the river. A. Having suf

发布时间：2020-08-17 12:48:54

     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

网友回答

(答案→)A. Having suffered
B. Suffering
C. To suffer
D. Suffered
解析：句意为“这条河已经遭受如此严重的污染，现在要想清理也许为时已晚了”。suffer 发生在 clean up 之前，且有 already 暗示，无疑要用现在分词的完成式作状语。
以上问题属网友观点，不代表本站立场，仅供参考！