15. The salesperson's_______. smile compromises his credibility, making him less trustworthy.
(A) mnemonic
(B) pertinacious
(C) protracted
(D) saccharine
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統計: A(4), B(9), C(4), D(15), E(1) #3233806
統計: A(4), B(9), C(4), D(15), E(1) #3233806