the meeting,at which i will give a speech ,is on a project of which i am the leader后面的of which是什么意思,是定语从句吗?为什么which前面要加of,而且of which在定语从句中不是等于whose吗,要是这样讲不通呀

Did he ____the plan which came up at the meeting? What's she saying at the meeting?What's she talking at the meeting?Which is right?Thanks at the sports meeting in the meeting 还是at the meeting That was the reason-------Mac refused to speak at the meeting.whythatwhichof which ---was said at the meeting is important.A:what B:which C:that -------Henry said at the meeting surprised everybody present.A.What B.That C.Which D.Whether All the plans _____will be discussed at the meeting are very important.A that B which C / D what I was very surprised at the way___ he spoke at the meeting.为什么不填,要用which的好话用in whichI was very surprised at the way___ he spoke at the meeting.为什么不填,要用which的话用in which,in which不等于where吗?有点糊涂 --Do you still remember___our teacher said at the class meeting yesterday?--Sure.A.that B.what C.how D.which He will speak__.A.at meeting B.in the meeting C.on the meeting D.at the meeting they're having a meeting at the meeting h_________ 应该是in the meeting 还是 at a meeting? -How long did the meeting last this afternoon?- How long did the meeting last this afternoon - It was supper time ______the meeting was over.答案是when 为什么at which不行? 在会上,用英语怎么说?A at meeting B at the meeting C in the meeting D in meeting the question _(discuss)at the meeting at the moment. She s___ at the meeting yesterday afternoon at the meeting 要怎么连读