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    I study math by lots of exercises . A. doing B. did C. do D. does【查看更多】

     

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     I study math by ____ lots of exercises.

    A．did              B．doing             C．do               D．does

     

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    I study math by　　 lots of exercises.?

    A.did　　 B.doing　　 C.do　　　　 D.does?

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