--- Why not the dancing? --- That's a go...

--- Why not the dancing?

--- That's a good idea. Let's them.

A. join; join

B. join in; join

C. join; join in

D. join in; join in

B 【解析】试题分析：句意：--为什么不加入到这个舞蹈中？--那是个好主意。让我们加入到他们中吧。join sb加入到某人的行列中；join in参加活动。结合句意，故选B。考点：考查动词的用法。

考点分析：

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