单项选择题

The governmental departments concerned are aware that there are downfalls ______ more cars on the roads.

A．to have
B．having
C．to having
D．on having
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单项选择题
The wind was so strong that it tore the flag ______.
A．by half
B．at half
C．in half
D．by halves
单项选择题
Most people believe that the governmental departments should give ______ service at minimum cost.
A．best
B．most
C．utmost
D．maximum
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