阿摩線上測驗
20. Although the vaccine isn't 100% _____, it lowers the chances of having severe complications from the flu.
(A) effective
(B) affective
(C) innate
(D) resultative
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統計： A(10), B(0), C(0), D(2), E(0) #3578089
統計： A(10), B(0), C(0), D(2), E(0) #3578089
