In order to ensure that he can attend the meeting,I called him up_英语解答

In order to ensure that he can attend the meeting,I called him up in advance.to在这里不是介词吗?
为什么ensure后面不加ing?

人气：126 ℃　时间：2020-05-26 04:28:23

解答

因为in order to 后要接动词原形,即 to + 动原构成不定式.