【題目】（題文）Keys _______ used for ______ the doors.

A. is, opening B. is, opened

C. are, opening D. are opened

【答案】C

【解析】

試題句意：鑰匙是被用來(lái)開(kāi)門(mén)的。考查固定短語(yǔ)be used for doing sth.被用于做什么；keys為復(fù)數(shù)形式，因此be動(dòng)詞用are.結(jié)合選項(xiàng)第三項(xiàng)正確。故選C

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