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    I think our duty to keep our environment clean and tidy. A. that B. this C. it D. one 【查看更多】

     

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    I think      our duty to keep our environment clean and tidy.

    A. that           B. this          C. it             D. one

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    I think ________ our duty to keep our environment clean and tidy.

    A. that

    B. this

    C. it's

    D. one

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    1 

    I think _______ our duty to keep our environment clean and tidy.

    A. this       B. that      C. it  D. one

     

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