4. User _______ can be helpful in product promotion, only when such a word-of-mouth strategy is implemented effectively.
(A) digestion
(B) exhibition
(C) testimonials
(D) amenities
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統計: A(4), B(10), C(49), D(8), E(0) #1770843
統計: A(4), B(10), C(49), D(8), E(0) #1770843