18. To fight against COVID-19, it is advisable _____ to wear masks _____ to keep social distancing.
(A) not; but
(B) more; than
(C) either; or
(D) neither; nor
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統計: A(20), B(30), C(398), D(47), E(0) #2556044
統計: A(20), B(30), C(398), D(47), E(0) #2556044