单项选择题

He is positive that the dictionary is just what I want.

A．sure
B．rational
C．content
D．doubtful
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单项选择题
The college offers courses in a variety of trades.
A．businesses
B．firms
C．occupations
D．works
单项选择题
The next morning she told us that the last guests didn't depart till well after midnight.
A．come
B．leave
C．come
D．appear
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