Our headmaster will us in the discussion this afternoon.
A. take part in
B. join in
C. join
D. attend
网友回答
A. take part in
B. join in
(答案→)C. join
D. attend
解析：take part in指参加活动或在活动中负有责任；attend仅仅表示“to go”，自己并不起积极作用；join in参加（活动）；join是及物动词，意思是参加，加入(团体)。经过比较，选C最好。