Every means ______ tried but without much result.

admin2009-09-15  30

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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