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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Tom looks so pale today. He （）ill.

A. must be
B. had to be
C. should be
D. shall be
单项选择题
It is nice to go for a walk（）a summer evening.

A. on
B. during
C. in
D. at
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