Whether enough blood is donated could be a(an) of life and death for the accident victims

问题补充：

Whether enough blood is donated could be a(an) of life and death for the accident victims.

A. concern

B. approach

C. affair

(答案)D. matter

答案：

@@A. concern@@B. approach@@C. affair@@(答案)D. matter

解析：题目意思是“是否有足够的血液被捐献是事关生死的事情”，a matter of life and death的意思是“生死攸关的事”。