—Would you like tothe discussion this Saturday?—Sorry I have an important meeting to.A. a

问题补充：

—Would you like tothe discussion this Saturday?

—Sorry, I have an important meeting to.

A. attend; join

B. join; attend

C. join; take part in

D. join in; attend

答案：

A. attend; join

B. join; attend

C. join; take part in

D. join in; attend

解析：动词用法辨析。Attend指参加会议，上课等；join参加组织，党派，团体；join in=take part in参加…活动；句意：你想参加这个星期六的讨论吗？—对不起。我有一个重要的会议要开。根据句意说明D正确。