The key ________ for locking the classroom door.

[　　]

A. uses
B. is used
C. is using
D. use

答案：B
提示：

be used for “用來做……”，后面接名詞或動(dòng)詞-ing形式，其中for表示目的，強(qiáng)調(diào)用途或作用。


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