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
—Would you like to go picnicking with us today—______, but it looks like rain.
A．Yes, I would like
B．I'm going to
C．Sorry, I don't want to
D．Well, I'd like to
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
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