.China is one of the largest countries in the world 9.6 million square (平方) kilometers.A

问题补充：

.China is one of the largest countries in the world, 9.6 million square (平方) kilometers.

A. to cover

B. covered

C. covers

D. covering

答案：

A. to cover

B. covered

C. covers

(答案→)D. covering

解析：考察非谓语动词.句意:中国是世界上最大的国家之一,面积有960万平方千米. 现在分词表示正在进行的伴随性动作,如果发生在谓语动词之前,则要用完成时态的现在分词,故选D.