13. With the help of ________ (aircraft without pilots), farmers can now have an eye on their
crops.
(A) districts
(B) drones
(C) droughts
(D) swings
答案:登入後查看
統計: A(39), B(289), C(92), D(125), E(0) #2166379
統計: A(39), B(289), C(92), D(125), E(0) #2166379
