阿摩線上測驗
17. _____, scientists have greatly increased the yield of crops such as corn, rice, and wheat.
(A) Used the laws of genetics
(B) Using the laws of genetics
(C) The laws of genetics
(D) The laws of genetics are to be used
答案：登入後查看
統計： A(1), B(22), C(0), D(2), E(0) #3848039
統計： A(1), B(22), C(0), D(2), E(0) #3848039
