8. I can't believe the medicine is so ___________. It did relieve the symptoms of my cold.
(A) effective
(B) efficient
(C) affective
(D) urban
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統計: A(49), B(27), C(10), D(2), E(0) #1909709
統計: A(49), B(27), C(10), D(2), E(0) #1909709