单项选择题

Most of us have come to realize that it is about time (that) we ______ effective measures to prevent all kinds of pollution.

A．take
B．took
C．must take
D．shall take
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单项选择题
Because of road works, traffic is restricted to one ______ in each direction.
A．lane
B．row
C．alley
D．path
单项选择题
The proofs have been twice read and some 28 errors in them were ______.
A．justified
B．placed
C．eliminated
D．identified
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