单项选择题

It ______ be the postman at the door. It’s only six o’clock.

A. mustn’t
B. can’t
C. won’t
D. needn’t
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单项选择题
You ______ buy a gift, but you can if you want to.
A. must
B. mustn’t
C. have to
D. don’t have to
单项选择题
The school advisers help you talk through your problems but they don’t give you any direct ______.
A. solution
B. target
C. measure
D. function
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