问题描述：
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?
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?
问题解答：
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