单项选择题

You ______ her in her office last Friday; she's been out of town for two weeks.

A．needn't have seen
B．might have seen
C．must have seen
D．can't have seen
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单项选择题
While a computer cannot replace an instructor, it can take over many tasks to lessen the usual burden of the instructor.
A．routine
B．serious
C．generalized
D．compulsory
单项选择题
Another big issue ______ the new republic is the problem of the education of its citizens.
A．confining
B．confirming
C．conforming
D．confronting
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