单项选择题

Seldom____ any mistakes during my past five years of service in the company.

A．I did make
B．I would make
C．did I make
D．would I make
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单项选择题
It is important to____ our awareness about environmental protection．
A．improve
B．make
C．form
D．raise（唤起，提高）
单项选择题
____the government agrees to give extra money, the theatre will have to be closed next month．
A．Unless
B．If
C．Since
D．As
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