单项选择题

The High Street is so narrow that the local government has decided to ______ it.

A．increase
B．lengthen
C．widen
D．extend
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单项选择题
During the Ice Ages, man developed the use of tools, and this is a way of protecting himself against______.
A．shortcomings
B．hazards
C．faults
D．conflicts
单项选择题
We will not go to the party ______ we are politely invited.
A．if
B．however
C．whether
D．unless
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