单项选择题

Good harvest this year has made it possible for us to supply walnuts ______ last year's prices.

A．at
B．in
C．against
D．on
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单项选择题
Draft (s) drawn ______ this credit must be negotiated in China on or before October 31, 2001.
A．under
B．with
C．on
D．in
单项选择题
The time of waiting for payment agreed upon by both sides is the period of ______.
A．shipment
B．draft
C．hill of lading
D．credit
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