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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。

题目来源:同步导学案课时练九年级英语上册人教版 > 阶段检测卷(六)

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