I made sure I had all the facts_ my fingertips before attending the meeting

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.

A. with

B. at

C. by

D. for

* Đáp án

B

* Hướng dẫn giải

Đáp án B.

Ta có cụm từ: At one’s fingertips: trong tầm tay

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