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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               
             
试题分析:考查倒装。句意:我从来没有见过这么难的问题,它花了我将近半个小时做出来。根据下文提到It took me almost half an hour to work it out 花费时间做出来发生在过去,所以我从来没有遇到,发生在过去的过去,用过去完成时, Never 不,放在句首,用部分倒装,所以选A项。       
考点 : 考查倒装
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