【題目】I didn’t know _______

A. where did he use to live B. where did he use to living

C. where he used to live D. where he used to living

【答案】C

【解析】

試題分析：句意：我不知道他過去住在哪里。賓語從句中的語序用陳述語序，排除A和B項；used to后面要跟動詞的原形，故選C。

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