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    It is believed that the college tuition fee will certainly the difficulty of a poor family. A. add to B. add up C. add up to D. add 【查看更多】

     

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    It is believed that the college tuition fee will certainly ________the difficulty of a poor family.

    　 A. add to　　 B. add up　　 C. add up to　 D. add

     

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