13. All clerks in the supermarket was given a _____ bill detector to help them spot fake money.
(A) referral
(B) nontrivial
(C) protracted
(D) counterfeit
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統計: A(8), B(3), C(10), D(15), E(0) #3710437
統計: A(8), B(3), C(10), D(15), E(0) #3710437