Keys used for the doors.A. is; opening B. is; openedC. are; opening D. are; opened 题目和参考答案——青夏教育精英家教网—

题目内容

1. Keys_________ used for__________ the doors.

A. is; opening B. is; opened

C. are; opening D. are; opened

1.C考查固定搭配。be used for doing意为"被用来做……"，主语是keys，谓语动词要用复数形式。

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