---Why are you still here? Everybody has gone to attend the lecture by the president.

--Oh, I ___________ about it!

A．wasn’t informed

B．hadn’t been informed

C．haven’t informed

D．didn’t inform

证券经营机构按从事证券业务的不同可分为（）。

A.证券经纪商

B.证券承销商

C.证券自营商

D.证券投资咨询机构