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

A.decideB.appreciateC.promiseD.operate

【答案】D

【解析】

考查動(dòng)詞詞義辨析。句意：我們的模型易于操作和維護(hù)。A. decide決定；B. appreciate欣賞；C. promise承諾；D. operate操作。由maintain（維護(hù)）可知，此模型是易于操作和維護(hù)的，operate符合句意。故選D項(xiàng)。

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