It is now believed that some damage to tissues may result from exposing it to frequent X-ray.       

Câu hỏi :

It is now believed that some damage to tissues may result from exposing it to frequent X-ray.       

A believed

B to tissues

C from

D it to

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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