The necessary device in the event of a power failure is not _______ installed due to the lack of a budget.

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问题 The necessary device in the event of a power failure is not _______ installed due to the lack of a budget.

选项 A、seldom
B、never
C、meanwhile
D、yet

答案D

解析空格内应填入副词，但所有选项都是副词。如果填入A选项或B选项，就变成两个表示否定的词连在一起，意思不通。D选项在词义上是最合适的。not yet是“还没有……”的意思。

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