单项选择题

It can sometimes be ______ for managers to secretly monitor the work of their employees.

A．intentional
B．comparative
C．necessary
D．rigid
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单项选择题
The audience listened ______ to Professor Warner's speech on the impact of global warming.
A．attending
B．attention
C．attentive
D．attentively
单项选择题
The bank manager needs to ______ every loan of over $10,000 from this branch.
A．emerge
B．display
C．approve
D．behave
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