问题描述：
5．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
为什么选C,不选B,请详解,
A．join B．take part C．take a part D．take part in
为什么选C,不选B,请详解,
问题解答：
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