Question

_______ impressed me was the boy’s ability to deal with this kind of difficult physics problem.

A．Which

B．What

C．It

D．That

Answer 1

B

試題分析：考查主語從句引導詞的區別。A哪一個；B 所……的="the" thing that/the things that; C it 是形式主語句型為：it is +adj.+to do sth.; D that 引導主語從句不作任何成分，也沒有意義。句意：所使我印象深刻的是哪個男孩處理各種物理難題的能力。故B正確。