AIDS is dangerous. ___ has not been able to be cured up to the present time.

Câu hỏi :

AIDS is dangerous. ___ has not been able to be cured up to the present time.

A they                        

B it                             

C themselves           

D its

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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