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Every means ____ tried out but never with success, as far as my knowledge goes.

A.is
B.are
C.has been
D.have been

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正确答案： C
答案分析：【句意】就我所知，每种方法都试过了，但都没有成功。
【难点】means虽以s结尾却是单数形式，因此谓语动词应选用第三人称单数。

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大学专业八级英语（词汇与语法）全真模拟练习及答案解析

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