问题描述：
___harder,you could have have passed this exam.(B)
A.Were you worked B.Had you worked
C.if you worked D.If you have worked
请详解一下,同时翻译一下
A.Were you worked B.Had you worked
C.if you worked D.If you have worked
请详解一下,同时翻译一下
问题解答：
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