Question

高一情态动词练习题求问？

He must have been late for the school yesterday, _____he？
A.didn't
B.haven't
C.mustn't
D.wasn't

为什么选D不选B？

Answer 1

此题考查反义疑问句。

1.当must+have done表示对过去的情况进行推测（一般句中有明确的过去时间状语）（此题即为此情况），问句要根据陈述部分谓语的情况用“didn't+主语”或“wasn't/weren't+主语”；此题为must have been即陈述部分谓语为been，则此反义疑问句用wasn't he。2.如果强调动作的完成（一般没有明确的过去时间状语），问句要用“haven't/hasn't+主语”。
例如：She must have read the novel last week,didn't she? 她上星期一定读了这本小说，是吗？ （为第一种情况)
You must have told her about it, haven't you?你一定把这事告诉她了，是吗？

（为第二种情况)

Answer 2

当must表示猜测时是80%以上的很可能的意思。
must+do表示对现在猜测
must+have done+过去时间，表示对过去的猜测
must+be+doing表示对正在进行的猜测

must have been late,相当于he was late，只是不能十分肯定，所以用了猜测，因此其反义疑问要与must后面实意动词保持一致。过去式，就用wasn't

Answer 3

这是考察must作情态动词时表推测的用法， must have been 是对过去的推测，所以要用过去时 wasn't. 祝学习进步！