单项选择题

21（）

A．he
B．who
C．which
D．what

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填空题
A. telephone B. philosophy C. bright D. rough
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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