阿摩線上測驗
17. Only in recent years have people become aware of the importance of environmental protection
and _____ various measures to prevent pollution from worsening.
(A) do they begin to take
(B) they begin to take
(C) began to take
(D) begun to take
答案：登入後查看
統計： A(33), B(28), C(31), D(90), E(0) #3195799
統計： A(33), B(28), C(31), D(90), E(0) #3195799
