50. Where is the best place to insert the sentence, “In the U.S. it’s widely used on citrus, corn, and other crops”?
(A) #A
(B) #B
(C) #C
(D) #D
(E) #E

答案：登入後查看
統計： A(8), B(3), C(44), D(5), E(2) #2277072