从方框内选择恰当的句子完成对话，其中有两项是多余的

A: Where have you been, Ben? I called, but you weren't in your office.

B:

A: Who did you go with?

B:

A: What did you do there?

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

A:

B: Do you think we can do something?

A: Yes, of course. We can write a story about it to CCTV.

B:  

A. That's too bad. B. Good idea. C. I have been to a paper factory. D. What's the problem? E. I went there alone. F. I was writing a story. G. The river has become very dirty.