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

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

A.subject to

B.upon

C.into

D.with

参考答案:

A