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【题目】We are not ready to go into production yet, for the new switch mechanism isn’t fully ______.

A.tried out B.tested out

C.worked out D.turned out

【答案】B

【解析】

试题分析:考查动词短语辨析。A.tried out 尝试B.tested out测试C.worked out 计算D.turned out证明;句意:这种新车还没有投入生产,它的发动机还没有完全通过监测。根据句意说明B项正确

考点 : 考查动词短语辨析

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