These machines have been idle for the past months.

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问题 These machines have been idle for the past months.

选项 A、been working well
B、been working badly
C、not been in service
D、not been running at all

答案D

解析 not been running at all是指“完全不运转，闲置的”。与本题划线词been idle的意思接近。been working well“运转良好”；been working badly“运转不良”；not been in sevice“没有服役，没被使用”。

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