问题

How much shall I pay for the telephone call—You _____. It’s free.
A:mustn't
B:shouldn't
C:don't have to
D:can't
B:shouldn't
C:don't have to
D:can't
正确答案是:
同类题型
It would be _____ a risk to let the child go to school by himself.
There’re a few new words in the article —What about _________in your dictionary
He is really nervous. He ______back and forth all the night waiting for the results.
She ______ another matchand in the light she made her way without making any noise