单项选择题

—Why does Sara know so much about Angkor Watt—She ______ have been there, or because of some other reasons.

A．must
B．oughtn't to
C．may
D．can't
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单项选择题
Go and see upstairs.
A．whether Mike is up to
B．what Mike is up to
C．what Mike does
D．what is Mike doing
单项选择题
—Why did you buy the car earlier—I ______ Tom in Boston by car next month, but I've changed my mind.
A．visit
B．will visit
C．am going to visit
D．was going to visit
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