阿摩線上測驗
5 The scientists are on the _______ of discovering a cure – they’re about to make an important discovery.
(A) verge
(B) usher
(C) behalf
(D) graze
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統計： A(2), B(1), C(2), D(1), E(0) #3429359
統計： A(2), B(1), C(2), D(1), E(0) #3429359
