Though it is one of the rarest metals, gold was one of the first to be discover

Câu hỏi :

Mark the letter A, B, C or D on your answer sheet to show the underlinedpart that needs correction in each of the following questions.

A. Though

B. Rarest metals

C. The first

D.  Discover

* Đáp án

* Hướng dẫn giải

Đáp án là D.

discover => discovered.

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