阿摩線上測驗
16 It will be difficult for athletes to _______ their sport skills if they stop training on a regular basis.
(A) retain
(B) injure
(C) descend
(D) plunge
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統計： A(157), B(15), C(12), D(10), E(0) #3226458
統計： A(157), B(15), C(12), D(10), E(0) #3226458
