Never______ such a difficult problem. It took me almost half an hour to work it out.
A．had I come across B．I had come across
C．did I come acrossD．I did come across
A               
             
試題分析：考查倒裝。句意：我從來沒有見過這么難的問題，它花了我將近半個小時做出來。根據(jù)下文提到It took me almost half an hour to work it out 花費時間做出來發(fā)生在過去，所以我從來沒有遇到，發(fā)生在過去的過去，用過去完成時， Never 不，放在句首，用部分倒裝，所以選A項。       
考點 : 考查倒裝
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