阿摩線上測驗
23. Hormones have many jobs, from promoting bodily growth to _____ to regulating metabolism.
(A) aid digestion
(B) an aid of digestion
(C) aiding digestion
(D) be of aid to digestion
(E) be aided
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統計： A(3), B(0), C(16), D(1), E(2) #3431574
統計： A(3), B(0), C(16), D(1), E(2) #3431574
