问题补充：
There will be a discussion tomorrow,all those who want to,please raise your hands.
A. join
B. take part
C. take a part
D. take part in
答案：
A. join
(答案→)B. take part
C. take a part
D. take part in
解析：join指参加某个组织成为其中一员，作及物动词用；take part表示参加某项活动，作不及物动词用； take part in也表示参加某项活动，但是后面要跟宾语。
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