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

A.decideB.appreciateC.promiseD.operate

【答案】D

【解析】

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

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