阿摩線上測驗
29. In the aftermath of the disaster, volunteer doctors treated hundreds of patients _______, refusing to accept any form of payment for their services.
(A) straight
(B) freely
(C) valiantly
(D) gratis
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統計： A(1), B(22), C(5), D(19), E(0) #3477191
統計： A(1), B(22), C(5), D(19), E(0) #3477191
