阿摩線上測驗
38 Random testing of cold refreshments___________ at fast food chains showed a number of outlets failing health
standards.
(A) serve
(B) served
(C) serving
(D) having served
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統計： A(15), B(122), C(54), D(25), E(0) #864416
統計： A(15), B(122), C(54), D(25), E(0) #864416