Câu hỏi :

The word "it" refers to.........

A. surgical procedures

B. accident victims

C. a pint of whole blood

D. surgery patients

* Đáp án

C

* Hướng dẫn giải

Dẫn chứng: Usually a pint of whole blood is donated, and it is then divided into platelets, white blood cells, and red blood cells

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