Question

英语题Now that the light went out,he_______have slept.

Now that the light went out,he_______have slept.
a.ought to b.must c.would d.should
选啥？为啥？
选a不对。

Answer 1

选D should
既然灯都灭了，他应该已经睡了，should 表达主观看法

Answer 2

B。既然灯已经灭了，他一定已经睡觉了。

The lights in his room went out, and he must have slept.

Answer 3

b.must 这是对一个过去时的肯定性的推测。