About 200 million years before all the continents were part of one vast land mass called Pangea

Câu hỏi :

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

A. million

B. before

C. part

D. one vast land mass

* Đáp án

* Hướng dẫn giải

Đáp án là B.

before => ago

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