单项选择题

We really appreciate it that you decided to ( ) the matter.

A．look into
B．look out
C．look after
D．look on
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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
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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