concern about food safety seems to be subject that is being discussed all over the worl

问题补充：

concern about food safety seems to be subject that is being discussed all over the world.

A. The; a

B. A; /

C. The; the

D. /; the

答案：

(答案→)A. The; a

B. A; /

C. The; the

D. /; the

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