单项选择题

I can't find Jenny everywhere. Where ______ she be

A．can
B．may
C．must
D．need
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单项选择题
Most trains _______ long distances have a dining car and a club car where refreshments are served.
A．to go
B．to be going
C．that goes
D．going
单项选择题
I don't doubt ______ he will come on time.
A．whether
B．which
C．what
D．that
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