单项选择题

By the time we got back to the office, the clients ______ for the airport already.

A．will have left
B．were left
C．had left
D．would have left
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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
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
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