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It was not until the end of prehistoric times that the first wheeled vehicles appearing

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It was not until the end of prehistoric times that the first wheeled vehicles appearing.

(A) It was

(B) Prehistoric

(C) wheeled vehicles

(D) Appearing

Giải thích

Đáp án D => appeared

Cấu trúc it + be + not until + thời gian + that + mệnh đề: không...cho đến tận khi...