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
After the Second World War fashionable short skirts ______ to ankle length.
A．shortened
B．dropped
C．lowered
D．lengthen
单项选择题
People tend to buy more things than ______.
A．it is necessary
B．being necessary
C．is necessary
D．to be necessary
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