6. Drones, the remote-controlled non-pilot flying objects, cannot be used in warfare as aircraft
_______
(A) hermits
(B) carriers
(C) occupants
(D) veterans
(E) rascals
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統計: A(1), B(38), C(9), D(5), E(5) #2911574
統計: A(1), B(38), C(9), D(5), E(5) #2911574