(A) In early days, hydrochloric acid was (B) done by (C) heating a mixture of sodium

Câu hỏi :

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction.

A. In early days

B. done

C. heating

D. with

* Đáp án

* Hướng dẫn giải

Đáp án : B

done -> made

To be made by: được tạo thành bởi cái gì

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