You should practice your eyes by looking at other surrounding things every thirty minutes; _______, they will get strenuous.

Câu hỏi :

You should practice your eyes by looking at other surrounding things every thirty minutes; _______, they will get strenuous.

A if so

B if

C therefore

D otherwise

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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