单项选择题

Because of the complexity of the modern machine, most offices require secretaries ______.

A. to have specified training
B. specified in traing
C. to train secifiedly
D. training specified
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单项选择题
When he was asked about the missing briefcase, the man ______ ever seeing it.
A. refused
B. denied
C. opposed
D. resisted
单项选择题
It is a legal ______ for parents to ensure that their children are provided with efficient education suitable to their age.
A. sympathy
B. obligation
C. impulse
D. influence
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