1. He was very rude to the customs officer, ________ of course made things even worse.
A. who B. whom C. what D. which
【答案】D
【解析】
【分析】
【详解】考查定语从句。句意：他对海关官员非常无礼，这当然使事情更糟了。此处为非限制性定语从句修饰上文整个句子，从句中缺少主语，故用关系代词which引导。故选D。
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