My brother is busy_for the exam.A preparing B to prepare C prepar_英语解答

My brother is busy_for the exam.A preparing B to prepare C prepared Dwas prepared...
My brother is busy_for the exam.A preparing B to prepare C prepared Dwas prepared.答案选A为什么不可以是B,不定式做宾语补足语,对Busy解释说明?

人气：120 ℃　时间：2020-02-03 19:48:41

解答

没有be busy to do sth 的说法
这里be busy doing sth 是固定搭配.楼主一定要记住.这是特殊的
楼主有不明白的还可再问.祝学习更上一层楼