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

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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