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14．--Will you please show me how to do the role-play exercise?--Sure．Now let me tell you first．A．which to do B．how to do C．when to do D．what to do 【查看更多】

 

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--Will you please show me how to do the role-play exercise?

--Sure．Now let me tell you                  first．

A．which to do         B．how to do               C．when to do          D．what to do

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