单项选择题

Please reply to our inquiry ( ) your earliest convenience.

A．by
B．upon
C．for
D．at
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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
单项选择题
( ) your price is the only solution to the dilemma.
A．Putting down
B．Take down
C．Let down
D．Bringing down
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