单项选择题

The committee is （） session; no one can enter the hall.

A．on
B．at
C．in
D．for

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单项选择题

After I paid the money, the shop assistant gave me a（）

A．receipt
B．reception
C．receiver
D．receptor

单项选择题

To reach a correct conclusion, they had debated the subject （）

A．naturally
B．elegantly
C．at last
D．at length

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