15. Now, remember, viruses _______ all the time, so the trick is to find a stable part of the virus - a part that doesn't really change from one variant to the next.
(A) maim
(B) mince
(C) mitigate
(D) mutate
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統計: A(0), B(0), C(0), D(3), E(0) #3257557
統計: A(0), B(0), C(0), D(3), E(0) #3257557