That smoking has a bad effect on our health has been proved.

Câu hỏi :

That smoking has a bad effect on our health has been proved.

A That smoking, which has bad effect on our health, has been proved.

B It has been proved that smoking is harmful for our health.

C Smoking badly affects our health is true.

D That bad effect of smoking on our health has been proved.

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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