Question

2. I think she must be our new teacher, _______?

2. I think she must be our new teacher, _______?
A. don’t I B. doesn’t she
C. mustn’t she D. isn’t she 为什么答案一定是D ，，，，B 为什么不对

Answer 1

D。因为I think 是可以去掉的，然后对be 否定。

Answer 2

你看下 must be 这个是系动词,,你就懂了

Answer 3

be是she的动词啊。