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Who were the zippers invented ________?

A. by B. for C. with D. at

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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