问题
选择题
(2013·甘肃河西五市一模)Look! The ground is wet. It must have rained last night, ________？
A．hasn't it
B．hadn't it
C．mustn't it
D．didn't it
答案
答案：D
选D 考查反意疑问句。句意：看！地是湿的。昨晚一定下过雨，是不是？It must have rained last night是推测语气，可改写为I think it rained last night，可见其反意疑问部分应为didn't it，故选D。