_____hearing that his father was ill,je was so anxious to be back that he immediately went to the station to buy ticket?
为什么前面要加一个on
单独的现在分词短语Hearing that his father was ill(听到他父亲生病,⋯)也可作本句话的时间状语,但在前面加了介词On后,则加强了语气。汉语意思则有:"一听到他父亲生病,⋯"。相当于As soon as he heard that his father was ill,...