阿摩線上測驗
72_________ on the board for more than two decades, the president knows all the details necessary to persuade the new
members.
(A) Having served
(B) Serving
(C) Services
(D) Served
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統計： A(29), B(25), C(1), D(8), E(0) #669055
統計： A(29), B(25), C(1), D(8), E(0) #669055