21.- ? -Yes.I'm looking for a pen. A.Can I help you B.What are you doing? C.What do you want to buy D.What do you like? 查看更多

 

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— _________?

—Yes,I'm looking for a pen.

A.Can I help you                                         B.What are you doing?

C.What do you want to buy                           D.What do you like?

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