Every means ______ tried but without much result.A、isB、areC、has beenD、have be

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问题 Every means ______ tried but without much result.

选项 A、is
B、are
C、has been
D、have been

答案 C

解析 means用作单数，故谓语动词应用单数形式；而由but后的分句句意可知方法已经试过了，应用完成时态。结合起来可知选[C]。

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