单项选择题

Sally's score on the exam is the lowest in the class. She ______ hard.

A．should have studied
B．must have to study
C．must have studied
D．needn't have studied
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单项选择题
It is obvious ______ on more important things.
A．which the money should we spend
B．what the money should we spend
C．that the money should we spend
D．that we should spend the money
单项选择题
I'll give you my telephone number in case you ______ want to get in touch with me again.
A．should
B．will
C．shall
D．need
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