30. Shipments between two countries are international ________ and must comply with applicable regulations before being cleared for entry.
(A) duplication
(B) transactions
(C) oscillation
(D) contention
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統計: A(39), B(412), C(37), D(43), E(0) #2301590
統計: A(39), B(412), C(37), D(43), E(0) #2301590