28. The government has instituted security regulations intended to prevent the entry of hazardous materials or ________ into the country.
(A) illumination
(B) indictment
(C) convention
(D) contraband
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統計: A(80), B(91), C(66), D(273), E(0) #2301588
統計: A(80), B(91), C(66), D(273), E(0) #2301588