Every possible means ______tried, but we can not open the door.A、areB、are being

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问题 Every possible means ______tried, but we can not open the door.

选项 A、are
B、are being
C、were
D、has been

答案 D

解析 means是单数，意为：方法；方式；手段 a means to an end: 达到目的的方法；He climbed the tree by means of a ladder. 他用梯子爬上了树。然后根上下文得出用完成时态。

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