单项选择题

We are a state-owned corporation ______ the export of tablecloths.

A．specialized
B．specializing
C．specialized in
D．specializing in
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单项选择题
The main purpose of the Customs supervision and control is to ______ China, seconomic, trade, scientific, technological and cultural exchanges with other countries.
A．supervise
B．control
C．promote
D．limit
单项选择题
We usually accept payment by irrevocable L C payable ______ shipping documents.
A．among
B．between
C．against
D．about
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