He stayed up late last night,___ a speech for his boss.A.to prepa_英语解答

He stayed up late last night,___ a speech for his boss.A.to prepare B.preparing
为什么不能选a表目的?

人气：160 ℃　时间：2020-02-02 20:06:24

解答

选A的情况下是不需要逗号的,表示目的.现在有逗号只能用现在分词做伴随状语.