13. The doctor gave the patient _____ to make him feel easy on mind.
(A) nocebo
(B) toxin
(C) venom
(D) placebo
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統計: A(2), B(3), C(3), D(24), E(0) #3230389
統計: A(2), B(3), C(3), D(24), E(0) #3230389