【題目】 He wrote a letter ______ he explained what had happened in the accident.

A. what B. which C. where D. how

【答案】C

【解析】試題分析：句意：他寫了一封信，在信中他解釋了事故中發(fā)生的一切。a letter是先行詞，從句本身主(he )--謂(explains )--賓(what had happened in the accident)成分齊全，缺少的是地點(diǎn)狀語(yǔ)�？芍褂藐P(guān)系副詞where.故選C。

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