1.D宾语从句如果主句主语是I,we第一人称且通常会出现 think / suppose / expect / believe / imagine,那么反意疑问句要根据从句来定.但如果不是,就要根据主句来做,如以下两个例子哦：
a.I think he is reading English now,isn't he?
b.He believes his father will come back soon,doesn't he?
2.D这是对于现在事实的肯定猜测.我再给你几个例子吧,方便区别.
a.He must be a teacher,isn't he?
b.He must be watching TV,isn't he?
c.He must have studied English for years,hasn't he?
d.He must have stayed up late last night,didn't he?(这句一定要注意,出现过去时间词,表示对于过去事情的猜测,一定要用过去时.这是最容易考察的.）
再加一些：这题是猜测哦.不是”必须“.如下题,You must study hard.这里就是必须的意思.所以你要按照情态动词的反意来做,就是mustn't you?
能明白不?再明白找我哦~