There will be a discussion tomorrow,all those who want to _,

題目：

There will be a discussion tomorrow,all those who want to _,please raise your hands.
A take part B take part in C joinD join in

解答：

There will be a discussion tomorrow,all those who want to participate（或come都可以)_,please raise your hands.明天將有一個討論會,有意想參加（或出席）的人請舉手.