Never______ such a difficult problem. It took me almost half an hour to work it

题干

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 across	D．I did come across

上一题下一题 0.85难度单项选择更新时间:2014-02-27 03:29:20

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