it has often broken down.是一句什么时态的句子,

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it has often broken down.是一句什么时态的句子,
it has often broken down.是一句什么时态的句子,

it has often broken down.是一句什么时态的句子,
是一个病态的句子.
it is often broken down.
或it has been broken down
它经常被破坏

完成时,break down是用来表示:什么东西经常出错、不能正常运作。
如: 电脑死机或车抛锚等。
这个短语和often一起出现时,一般不用完成时,只要一般现在时就可以了,即:
It often breaks down.

simple present.