阿摩線上測驗
21 If immunity achieved as a result of being vaccinated starts to _______ , a booster shot, a third dose of a
vaccine, is recommended.
(A) wane
(B) multiply
(C) duplicate
(D) permeate
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統計： A(3), B(1), C(0), D(1), E(0) #3166221
統計： A(3), B(1), C(0), D(1), E(0) #3166221
