Once you can overcome your difficulty, the problems may well become a source of strengthen to your marriage and to your faith existence. 

Câu hỏi :

Once you can overcome your difficulty, the problems may well become a source of strengthen to your marriage and to your faith existence. 

A. Once

B. overcome

C. may well become

D. strengthen

* Đáp án

D

* Hướng dẫn giải

Đáp án D.

strengthen ----> strength

Sau giới từ là 1 động từ thêm ING nên sẽ là strengthening

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