46. The COVID-19 virus is extremely _____ and there are many unknowns
about it.
(A) contextual
(B) essential
(C) complex
(D) simple
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統計: A(17), B(10), C(157), D(7), E(0) #3060197
統計: A(17), B(10), C(157), D(7), E(0) #3060197