【________wheelisthoughttobe________firstinventionof________transportation.A.The;the;不填B.The;a;theC.A;the;aD.A;a;不填】

　　________wheelisthoughttobe________firstinventionof________transportation.

　　A.The;the;不填

　　B.The;a;the

　　C.A;the;a

　　D.A;a;不填