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    12、He made a great invention again,       helpful to our daily life.

    A．I think it is                  B．I think which is

    C．I think it                     D．which I think is

    12、D

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    He made a great invention again,       helpful to our daily life.

    A．I think it is                  B．I think which is

    C．I think it                     D．which I think is

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