阿摩線上測驗
21 In many countries, it is customary to leave a______ while dining out.
(A) tip-off
(B) gratitude
(C) gratuity
(D) rip-off
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統計： A(50), B(16), C(32), D(14), E(0) #3074687
統計： A(50), B(16), C(32), D(14), E(0) #3074687
