阿摩線上測驗
25. For the purposes of knowing _____ a traveler will transmit virus to others, antigen tests will suffice.
(A) whether
(B) what
(C) which
(D) whenever
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統計： A(94), B(37), C(21), D(30), E(0) #2877476
統計： A(94), B(37), C(21), D(30), E(0) #2877476
