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【题目】We are not ready to go into production yet.The new switch mechanism isn't fully__________.( )
A.worked out
B.left out
C.turned out
D.tested out

【答案】D
【解析】考查动词短语辨析。根据句意:我们尚未准备好投入生产。新的开关装置还没有完全检验好。work out 解决,计算出;turn out 证明是,结果是;leave out 遗漏,省略;test out 检验,试验。

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