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    【题目】Our model is easy to ________ and maintain.

    A.decideB.appreciateC.promiseD.operate

    【答案】D

    【解析】

    考查动词词义辨析。句意：我们的模型易于操作和维护。A. decide决定；B. appreciate欣赏；C. promise承诺；D. operate操作。由maintain（维护）可知，此模型是易于操作和维护的，operate符合句意。故选D项。

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