阿摩線上測驗
3. ______ , bottle-nosed dolphins become talented performers at many aquariums.
(A)When to train
(B)Are training
(C)When trained
(D)To train them
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統計： A(13), B(1), C(204), D(37), E(0) #589472
統計： A(13), B(1), C(204), D(37), E(0) #589472
