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【题目】Who were the zippers invented ________？
A. by B. for C. with D. at
【答案】A
【解析】句意：拉链是谁发明的？A. by被；B. for 为了；C. with与……一起；D. at在。who实际上是by的宾语，代替whom，用作动词的执行者，故答案为A。
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题目内容
【题目】Who were the zippers invented ________？
A. by B. for C. with D. at
【答案】A
【解析】句意：拉链是谁发明的？A. by被；B. for 为了；C. with与……一起；D. at在。who实际上是by的宾语，代替whom，用作动词的执行者，故答案为A。