50 Those who plan to travel abroad are urged to have the COVID-19 ______ before their departure to build immunity against the virus.
(A) vaccine
(B) accentuation
(C) diagnosis
(D) infection
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統計: A(792), B(35), C(86), D(148), E(0) #2785429
統計: A(792), B(35), C(86), D(148), E(0) #2785429