单项选择题

It ______ around nine o'clock when I drove back home because it was already dark.

A．had to be
B．was to be
C．must have been
D．must be
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单项选择题
It is no use ______.
A．to buy books and not to read them
B．buying books and not to read them
C．buying books and not reading them
D．to buy books and not reading them
单项选择题
Now the committee ______ seven members.
A．consist of
B．is consisting of
C．is consisted of
D．consists of
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