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the big clock which used to strike the hours day and night.为

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the big clock which used to strike the hours day and night.为什么这里的used 不是 was used呢?
big clock 应该要用被动语态吧?求指教!
整个句子是:the big clock which used to strike the hours day and night was damaged many years ago.
the big clock which used to strike the hours day and night.为
use用法
used to过去常常
be used to do被用来做
be used to doing习惯于做
used to中的use没有"用"的意思 不存在clock被use 这是一个习惯用法 指"过去经常性的行为"