单项选择题

Many countries face some serious problems of land use, ______ result from population growth and the demands of modem technological living.

A．which most
B．most of which
C．most which
D．of most which
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单项选择题
Playing table tennis is her ______.
A．hobby
B．care
C．sport
D．habit
单项选择题
Mr. Smith ______ working till he was seventy years old.
A．kept up
B．kept on
C．kept to
D．kept out
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