单项选择题

These drawings( )the wall are process sheets.

A．in
B．over
C．on
D．/
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单项选择题
Textile business has become more and more difficult( )the competition grew.
A．as
B．befor
C．since
D．after
单项选择题
Smoking does great harm to our health. ( ) is smoking allowed in public places.
A．In no time
B．At a time
C．At all times
D．At no time
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