Tailor looks sleepy. He must______ to bed very late last night.

Tailor looks sleepy. He must______ to bed very late last night.
A、had gone
B、have gone
C、be going
D、go
【正确答案】：B
【题目解析】：B Tailor(人名)看起来有些困，他一定是昨天晚上睡觉太晚了。用must have done 这个结构，表示对过去发生动作的一种肯定性的猜测。