阿摩線上測驗
2 _______ dogs can assist customs officers in checking illegal drugs in the luggage of the passengers at the airport.
(A) Guide
(B) Hunting
(C) Detector
(D) Pet
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統計： A(3), B(4), C(58), D(1), E(0) #3251412
統計： A(3), B(4), C(58), D(1), E(0) #3251412
