1.He finished his homework,then he went on _______a letter.
问题描述：
1.He finished his homework,then he went on _______a letter.
a.write b.writing c.with writing d.to write
为什么不选b?
2.＿＿＿where to go,he asked a policeman the way.
a.Having lost his way and not knowing
b.Losing his way and didn't know
c.Lost his way and not knowing
d.lost his way and didn't know
答案好像是d,为什么不选a?
答
1.go on doing是指在做某事的期间中断,之后继续做同一件事；而go on to du是指在做完某事后继续做另一件事,从1题来看,他是在做完作业后继续做另一件事（写信）,所以选D
2.应该就选A,这是伴随状语,应该用动名词,而不是谓语形式的D.