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
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单项选择题
One of the very important documents in the foreign trade business is BL. B L is the abbreviation for ______.
A．Bill of Lading
B．Commercial Invoice
C．Buying Contract
D．Letter of Credit
单项选择题
We have received your letter of 23 November ______ reply to ours of 12 November.
A．to
B．in
C．for
D．on
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