单项选择题

Barbara did not have time to go to the concert last night because she was busy ______ for her lecture.

A．to preparing
B．to be prepared
C．preparing
D．being prepared
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单项选择题
Seldom ______ to see his uncle.
A．he goes
B．goes he
C．does he go
D．he does go
单项选择题
The old man should listen to the doctor' s suggestion that he ______ in bed.
A．stay
B．stays
C．stayed
D．staying
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