问题

_______ 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

正确答案是：

同类题型

He has been collecting shells ______ three and a half years.

Have you ever traveled to any foreign country—Sure. I in a small town in the USA with my grandparents.

1—- doesthe baby mouse weigh —-About20grams.

He is not native; if he were, we ______ this discussion over his identity.

Mr. Lee told us an interesting story yesterday. Itmade all of us_______ .