单项选择题

The reason he has been such a success ______ he never gives up.

A．is what
B．is that
C．is because
D．is
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单项选择题
Why is the university doing so much building The number of students ______ that there aren't enough classrooms.
A．have increased so rapidly
B．has increased so rapid
C．have increased so rapid
D．has increased so rapidly
单项选择题
With so much work on hand, you ______ to see the game last night.
A．mustn't go
B．shouldn't go
C．couldn't have gone
D．shouldn't have gone
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