Once you can overcome your difficulty, the problem may well become a source

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. Once

B. overcome

C. may well become

D. strengthen

* Đáp án

D

* Hướng dẫn giải

Đáp án D

Strengthen => strength vì sau giới từ of dùng danh từ

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