Every means_____tried out but never with success, as far as my knowledge goes.A、

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问题 Every means_____tried out but never with success, as far as my knowledge goes.

选项 A、is
B、are
C、has been
D、have been

答案 C

解析 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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