单项选择题

( ) is generally accepted, L/C must be established 15 days before shipment.

A．It
B．As
C．That
D．What
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单项选择题
Please reply to our inquiry ( ) your earliest convenience.
A．by
B．upon
C．for
D．at
单项选择题
Most electronic devices of this kind, ( ) manufactured for export, are tightly packed.
A．that are
B．as are
C．which is
D．it is
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