【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:鑰匙是被用來開門的?疾楣潭ǘ陶Zbe used for doing sth.被用于做什么;keys為復(fù)數(shù)形式,因此be動詞用are.結(jié)合選項第三項正確。故選C

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