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    swim – swam – swum 【查看更多】

     

    题目列表(包括答案和解析)

    How long       you       ?
    -I swam for half an hour.
    [     ]
    A. have；been swimming        
    B. have；swum        
    C. do；swim        
    D. did；swim

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     Look! Some children ____________ in the river.                               

    A. swim                       B. swam                              C. have swum        D. are swimming

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    选择填空:

    I saw some boys ________ in the lake.

    ［　　 ］

    A. swim　　 B. to swim　　 C. swam　　 D. swum

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