3. All our mobile phone sales are covered by a 12-month money-back _____, so if you encounter any problem within a year of purchase, we will assist you without any charge.
(A) goal
(B) compliment
(C) contract
(D) guarantee
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統計: A(5), B(13), C(27), D(165), E(0) #3426332
統計: A(5), B(13), C(27), D(165), E(0) #3426332