关于谁实际上在演讲，似乎有一些困惑。

There seems to be some ___confusion about who is actually giving the talk.

这引起了一些困惑，因为课程没有完全准备好。

This caused some ___confusion because the courses were not completely prepared.

计划的突然改变在团队成员中造成了很多困惑。

The sudden change in plans created a lot of ___confusion among the team members.