单项选择题

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

A．sure
B．angry
C．doubtful
D．worried
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单项选择题
About one quarter of the workers in the country are employed in factories.
A．third
B．fourth
C．tenth
D．fifteenth
单项选择题
This kind of material was seldom used in building houses during the Middle Ages.
A．never
B．rarely
C．often
D．only
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