Every means ______tried out but no one works. I have run out of my patience.

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问题 Every means ______tried out but no one works. I have run out of my patience.

选项 A、is
B、are
C、has been
D、have been

答案C

解析 means虽然以s结尾,但表示单数形式,意为“方法,手段”,故排除B、D。“试”这一动作已经完成了(才知道都不成功),因此用完成时态。
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