——Did you know any French before you arrived in Washington?

——Never ____ it, actually.

A．had I learned

B．have I learned

C．I have learned

D．I had learned

虚拟图书馆提供的信息主要为（）。

A.特定学科的专业网络导航

B.网页信息的全文

C.综合各学科的网络导航

D.提供文献的馆藏信息