— Food problem is becoming a big one in China! —I think the food before going to shops o

问题补充：

— Food problem is becoming a big one in China!

—I think the food before going to shops or supermarkets.

A. is checked

B. is checking

C. should be checked

D. should check

答案：

A. is checked

B. is checking

(答案→)C. should be checked

D. should check

解析：句意：食品问题正在成为中国的一个大问题！我觉得在去商店或超市之前应该检查一下食物。food是check这一动作的承受者，该用被动语态， 结合句意，此处应用带情态动词的被动语态，所以选C。