题目内容
4．The playground is wet this morning．It must have rained last night．（改为反意疑问句）The playground is wet this morning．It must have rained last night，didn'tit？
分析 今天早上操场是湿的．昨晚肯定下雨了，不是吗？
解答 答案：didn't； it．居中must have rained是对过去的事情进行肯定猜测，故反义疑问句部分用一般过去时，有实意动词rain，故借助于did，根据反义疑问句的规则前肯后否，故答案是didn't it．
点评 本题考查的是反义疑问句，掌握其规则即可作答．
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