题目内容

【题目】（题文）Keys _______ used for ______ the doors.

A. is, opening B. is, opened

C. are, opening D. are opened

【答案】C

【解析】

试题句意：钥匙是被用来开门的。考查固定短语be used for doing sth.被用于做什么；keys为复数形式，因此be动词用are.结合选项第三项正确。故选C

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