单项选择题

The loading, unloading, transshipment and transit of inward and outward mail bags are subject to Customs control and a ______ wya bill should be submitted to the Customs by the enterprise providing prviding postal service.

A．cover
B．covering
C．covered
D．haveing covered
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单项选择题
Lloyd's, an association of London underwriters, developed from a small seventeenth century London coffee house, ______ underwriters at that time met to do business.
A．where
B．in that
C．which
D．that
单项选择题
Your early establishment of L C will enable us to ship your order ______ very good time.
A．in
B．at
C．on
D．within
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