The man has been in____ doctors describe as a vegetative （植物的） state for six years．
| A．what | B．which | C．that | D．how |
—— Must I take a bus ?
—— No, you＿＿＿＿. You can walk from here.
| A．must not | B．don’t | C．don’t have to | D．had better not to |
—— I didn’t see her yesterday.
—— Oh, but you ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿.
| A．must have | B．ought to | C．should have | D．cannot have |
They must have been here the day before yesterday,＿＿＿＿?
| A．mustn’t they | B．didn’t they | C．mustn’t have they | D．had they |
She＿＿＿＿＿＿＿＿the film. She knows nothing about it.
| A．can’t see | B．can’t have seen | C．must see | D．mustn’t have seen |
—— Nacy＿＿＿＿＿＿＿＿＿ the letter from her mother.
—— No, she can’t have. The postman hasn’t come yet.
| A．can receive | B．can have received | C．must have received | D．must receive |