[单项选择题] The loading, unloading, transshipment and transit of inward and outward mail bags are subjec

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[单项选择题] The loading, unloading, transshipment and transit of inward and outward mail bags are subject to Customs control and a ( ) way bill should be submitted to the Customs by the enterprise providing postal service.

A.cover

B.covering

C.covered

D.having covered

参考答案:

B