30 Kevin, a doctor in a _____ agency, travels to Africa at his own expense to help people there.
(A) volcanic
(B) victorious
(C) voluntary
(D) vulnerable
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統計: A(108), B(193), C(674), D(140), E(0) #3116962
統計: A(108), B(193), C(674), D(140), E(0) #3116962