Question

英语单项选择题？

This office is very dirty and in a mess, it _____cleaned.
A. cant have been B. mustnt have been
C. wouldnt have been D. shouldnt have been

Answer 1

1. This office is very dirty and in a mess; it ________ cleaned.
A. can’t have been
B. mustn’t have been
C. wouldn’t have been
D. shouldn’t have been
A
【解析】考察情态动词，can't 不可能 mustn't 禁止 shouldn't 不应当 wouldn't 不会
句意为，这个房间乱七八糟，不可能已经打扫过的。

Answer 2

为您解答
A
表示对已经发生的事情很有把握的否定推测

Answer 3

这题应该选B，must have been