【題目】He was very rude to the customs officer, ________, of course, made things even worse.

A. who B. whom C. which D. what

【答案】C

【解析】

試題解析：考查非限制性定語從句引導(dǎo)詞。此處需要分析句意：他對那個海關(guān)官員非常粗魯，這當然讓事情變得更加糟糕了。故此處的關(guān)系詞應(yīng)該代指前半句所陳述的事實，而不是那個海關(guān)官員，故代指事物，用which。故選C。

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