题目内容
12．Mike was ill yesterday， he didn't go to school（ ）| A． | if | B． | but | C． | so | D． | or |
分析 麦克昨天病了，所以他没有去上学．
解答 答案：C．
if意思是"如果"引导条件状语从句；but意思是"但是"表转折，前后是并列的分句；so意思是"所以"前面的句子表示原因，后面的句子表示结果；or意思是"或者"，表示选择．根据"Mike was ill yesterday"以及"he didn't go to school"可知他没上学的原因是他病了，也就是前一句是原因，后一句是结果，所以要用so．
点评 首先要掌握这几个词的意思以及用法，然后结合具体的语句，就可以做出正确选择．
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