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
The ______ of a cultural phenomenon is usually a logical consequence of some physical aspect in the life style of the people.
A．implementation
B．manifestation
C．demonstration
D．expedition
单项选择题
I don't know you want to keep the letter. I've ______ it up.
A．cracked
B．torn
C．broken
D．disposed
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