单项选择题

Television is another major instrument of communication ______ us to see as well as to hear the per former.

A．permitted
B．permit
C．permitting
D．being permitted
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The buses, ______ were already full, were surrounded by an angry crowd.
A．most of which
B．both of which
C．few of them
D．those of which
单项选择题
Many people believe that our species ______ threatened with extinction. IA] is [BI are [C] are to be [D]used to be
Many people believe that our species ______ threatened with extinction.
IA] is [BI are [C] are to be [D]used to be
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