William is an authority________medieval tapestries.

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions
 William is an authority________medieval tapestries.

A. on

B. with

C. about

D. in

* Đáp án

* Hướng dẫn giải

Đáp án là A. Cấu trúc: be an authority on ..: là chuyên gia về ....

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