摘要： He was seriously ill. That’s he didn’t appear at the party. A. because B. what C. why D. when [解析]选C.考查表语从句.why引导的表语从句内容是“某一结果 .而because引导的表语从句内容是“原因 . 生病是原因.没去参加party是结果.故选C.

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