阿摩線上測驗
23. For older people, doing exercises in swimming pools is especially helpful _____ the buoyant effect of water.
(A) because of
(B) because
(C) for
(D) since
答案：登入後查看
統計： A(173), B(26), C(45), D(4), E(0) #2509981
統計： A(173), B(26), C(45), D(4), E(0) #2509981
