James is busy practising for the school concert.They have fun riding with their friends.这里的practising, riding都是分词形式(没有介词,不是介词+V-ing形式),在句中和前面内容的连接感觉不是很紧密,这里的成分应如何分析?这种分词的内容可以...
In other markets low prices would force producers to shut mines. Not for cobalt. The price has already fallen below many miners’ break-even point. 麻烦问一下老师,Not for cobalt.是什么意思啊?