68 A: I need to buy medicine for my splitting headache. B: Here is the one you can take. It is _____ , no prescription needed.
(A) clinic
(B) side effect
(C) over-the-counter
(D) symptom
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統計: A(36), B(7), C(85), D(21), E(0) #3074389
統計: A(36), B(7), C(85), D(21), E(0) #3074389