【题目】Our model is easy to ________ and maintain.
A.decideB.appreciateC.promiseD.operate
在线课程【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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