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    23．Though the teacher had tried to make the problem easy , still Lily and her partner were at a loss. A．understood B．understanding C．to understand D．to be understood 【查看更多】

     

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    .

    Though the teacher had tried to make the problem easy__________, still Lily and her partner were at a loss.

           A．understood       B．understanding   C．to understand          D．to be understood

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    .
    Though the teacher had tried to make the problem easy__________, still Lily and her partner were at a loss.

    A．understoodB．understandingC．to understandD．to be understood

    查看答案和解析>>


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