21 When you tell the driver to “keep the change,” you are giving the change as a__________ .
(A) bonus
(B) tax
(C) fare
(D) tip
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統計: A(5), B(1), C(8), D(97), E(0) #2295949
統計: A(5), B(1), C(8), D(97), E(0) #2295949