阿摩線上測驗
12.________ in Africa as a volunteer, she understood the real impact of poverty.
(A) Have been working
(B) Having worked
(C) Had working
(D) Had been working
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統計： A(33), B(212), C(43), D(179), E(0) #2982909
統計： A(33), B(212), C(43), D(179), E(0) #2982909
