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
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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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The last few weeks have been enjoyable.
A．close
B．near
C．past
D．several
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