The key for opening the door of the room.A. usesB. is usingC. is usedD. used

发布时间：2020-08-21 14:14:20

The key      for opening the door of the room.
A. uses
B. is using
C. is used
D. used

网友回答

A. uses
B. is using
(答案→)C. is used
D. used
解析：此题重点考查固定短语be used for doing sth被用来做某事。
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