题目内容
1．Look，the ground is wet．It must have rained last night，_________？（ ）| A． | wasn't it | B． | hasn't it | C． | didn't it | D． | mustn't it |
分析 看，地上是潮的．昨晚肯定下雨了，对吗？
解答 答案是C．本题考查含推测的情态动词的反义问句．反义问句的基本结构是"陈述句+简略疑问句？"，疑问句中的主语和助动词与陈述句一致；当陈述句含推测的情态动词时，疑问句中的助动词的判断方法是"去掉表示推测的情态动词，将句子还原"；本句还原为"It rained last night"，可见还原后的句子是含实意动词的过去时，所以助动词用did，答案选择C．
点评 反义问句的解题，首先理解反义问句的作用--证实上文的内容；其次理解反义问句的基本结构；并且积累常见的特殊结构，最后结合语境判断．
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