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.