单项选择题

Mike looks so sleepy in the class; he ______ up last night.

A．must stay
B．should have stayed
C．must have stayed
D．is sure to stay
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单项选择题
______ in a famed university abroad was what his parents wished for.
A．The boy to be cultivated
B．The boy cultivated
C．The boy's being cultivated
D．The boy was cultivated
单项选择题
She had to exercise all her tact to prevent ______ between the two opinionated guests.
A．conflicts
B．contentions
C．contests
D．clashes
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