The original canal system began around the year 605, when China's
emperor Yang realized that he needed a better way to move foods and feed his
army, so the emperor ordered the construction of the first section of the Grand
Canal________(connect) those existing canals, lakes and rivers.
请问老师们这个空为什么是connecting不是to connect，不可以理解为修建运河为了连接吗，如果填connecting又是在做什么成分呢？谢谢！
