It was suggested that Tom studied the document more thoroughly before attempting to pass

Câu hỏi :

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

A. was

B. studied

C. thoroughly

D. attempting to

* Đáp án

* Hướng dẫn giải

Đáp án là B.

studied => had studied, vì QKHT + before + QKĐG/ V-ing

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