问题补充：
--- Would you like to Professor Smith’s lecture this Sunday?
--- Sorry, I have an important meeting to .
A. attend; join
B. join; attend
C. attend; attend
D. join; take part in
答案：
A. attend; join
B. join; attend
(答案→)C. attend; attend
D. join; take part in
解析：考查动词“参加”的用法。attend 出席，参加，宾语是会议、讲座。婚礼等等。join 的宾语是组织，团体，某人当中，take part in的宾语是活动，句意：你想要参加这个周日史密斯教授的讲座吗？对不起，我有一个重要的会议要参加。所以选C。
