Shall we ___ this singing?---That's a good idea.Let's ____ them.( )A.join in,join in B.join,join C.join in,join D.join,join in

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Shall we ___ this singing?---That's a good idea.Let's ____ them.( )A.join in,join in B.join,join C.join in,join D.join,join in
Shall we ___ this singing?---That's a good idea.Let's ____ them.( )
A.join in,join in B.join,join C.join in,join D.join,join in

Shall we ___ this singing?---That's a good idea.Let's ____ them.( )A.join in,join in B.join,join C.join in,join D.join,join in
C