I was greatly impressed the speech by the mayor of Shanghai before the final voting for E

问题补充：

I was greatly impressed the speech by the mayor of Shanghai before the final voting for EXPO .

A. to

B. over

C. with

D. on

答案：

A. to

B. over

(答案→)C. with

D. on

解析：考查介词搭配：sb be impressed with/by…,某人对…印象深刻，句意：我对世博会最后投票前的上海市长的演讲印象非常深刻。选C。