单项选择题

A．At night.
B．At noon.
C．In the morning.
D．In the afternoon.
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问答题
在现代条件下，这需要程度不同的中央控制，从而就需要获得诸如经济学家和运筹学家等专家的协助。
单项选择题
A．Because she knew the two men.B．Because she thought it was her husband.C．Because she was waiting for them.D．Because she was afraid of them.
A．Because she knew the two men.
B．Because she thought it was her husband.
C．Because she was waiting for them.
D．Because she was afraid of them.
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