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More than one proof ________, showing that it was he who murdered his wife.

A.have been found out 

B.has been found out

C.has found out 

D.have found out

答案:B解析:由every, each, many a/an, more than one 等+名詞作主語時,句子謂語動詞用單數形式;find與 proof之間是動賓關系,故答案為B。

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