单项选择题
You ______ be too careful when you are driving.
A．should
B．needn't
C．cannot
D．must
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单项选择题
--I posted the package a week ago.--Then they ______ the package by now. It usually takes 5 days.
A．must received
B．can have received
C．ought to have received
D．should received
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单项选择题
______ she got the first place in the final exam made her very happy.
A．That
B．What
C．It
D．When
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