Even today poverty is still a big problem in the United States more than 10 percent of

问题补充：

Even today, poverty is still a big problem in the United States, more than 10 percent of the whole population.

A. and that affect

B. affected

C. affecting

D. it affects

答案：

A. and that affect

B. affected

(答案→)C. affecting

D. it affects

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