7. Thanks to the vaccine, Sarah is now _____ to the virus and does not have to worry about getting sick.
(A) fragile
(B) allergic
(C) immune
(D) vulnerable
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統計: A(10), B(21), C(139), D(18), E(0) #3426216
統計: A(10), B(21), C(139), D(18), E(0) #3426216