阿摩線上測驗
37. Had the regulatory framework _____ in a more timely manner, the ensuing crisis might have been averted.
(A) implemented
(B) been implemented
(C) being implemented
(D) having implemented
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統計： A(6), B(48), C(5), D(1), E(0) #3873133
統計： A(6), B(48), C(5), D(1), E(0) #3873133
