阿摩線上測驗
7 Customs Administration should make sure that duty __________ on products transported inside the country.
(A)pays
(B)to be paid
(C)is paying
(D)has been paid
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統計： A(6), B(8), C(2), D(156), E(0) #1043738
統計： A(6), B(8), C(2), D(156), E(0) #1043738
