题目内容
15．He didn't go to school yesterday ________ he was ill．（ ）| A． | because | B． | because of | C． | if | D． | so |
分析 他昨天没有去上学，因为他病了．
解答 because因为，表示原因，引导原因状语从句；because of因为，后跟名词或动名词；if如果，引导条件状语从句；so因此，所以，表示结果．由He didn't go to school yesterday可知because he was ill．故选A．
点评 做此题时首先读懂句子，然后判断从句的类型，最后根据所给的连词做出正取的选择．
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