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