从方框中选择合适的选项补全对话。

A: Where have you been, Li Hai? I called you, but you weren't in.

B:

A:

B: I found that the factory was pouring waste water into the river near it. Lots of fish have died.

A:

B: Do you think “Greener China” can do something?

A:  if they know about this thing, they will prevent it. Let's write to them at once.

B:  I think everything will become better.

A. What did you do there? B. Good idea. C. Yes, of course D. That's terrible. E. I've been to a chemical factory