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
He managed to save ______ he could to tend the homeless boy.
A．what little time
B．so little time
C．such little time
D．how little time
单项选择题
Generally speaking, ______ immigrants cannot totally cut the tie with their motherland and be assim ilated by the foreign culture.
A．most
B．the most
C．most of[B]
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