We’ve never had any problem with our car in the past three years; it’s highly reliable in (operate) ______.

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问题 We’ve never had any problem with our car in the past three years; it’s highly reliable in (operate) ______.

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答案operation

解析 根据句子结构可以看出in后需要一个名词来做宾语,operate的名词为operation,意为“操作,运转”。这里-tion为名词性词缀,如;act-action;construct-construction;relate-relation等等。
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