题目

He didn’t go to school yesterday _______ he was ill. A. because  B. because of     C. if     D. so   答案：A 【解析】A考查连词的用法。because引导的状语从句，根据句意：他昨天没来上学是因为生病了。B后面接名词或名词性短语。D经常与that搭配引导目的或者结果状语从句。故选A。

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