The government will take some effective measures to control the heavy smogthe northern Chi

问题补充：

The government will take some effective measures to control the heavy smogthe northern China.

A. blankets

B. to be blanketed

C. blanketing

D. blanketed

答案：

A. blankets

B. to be blanketed

(答案→)C. blanketing

D. blanketed

解析：句意：政府将采取有效的措施控制笼罩在中国北方的大雾。这里需要定语修饰smog，因为smog和blanket是主动关系，用现在分词做定语，所以选C。