单项选择题

Concerning the payment for the machines to be imported by us, we suggest that we make payment ______ three annual installments without interest.

A．by
B．with
C．for
D．on
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单项选择题
Owing to the slack demand ______ their products for the time being, they do not think it advisable to buy the machine.
A．of
B．for
C．on
D．in
单项选择题
进出口许可证的有效期一般为( )个月。
A．6
B．12
C．18
D．24
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