53. By ____ garbage, we can reduce the amount of garbage put into our environment.
(A) keeping
(B) giving away
(C) hiding
(D) sorting
答案:登入後查看
統計: A(186), B(498), C(161), D(2690), E(0) #2702736
統計: A(186), B(498), C(161), D(2690), E(0) #2702736