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why做宾语从句时,相当于什么介词加which

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why做宾语从句时,相当于什么介词加which
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答案和解析
why引导定语从句时等于for which
why引导宾语从句时等于the reason why 也就等于the reason for which
例:
We don't know the reason why they have broken up with each other.= We don't know why they have broken up with each other.
我们不知道他们的关系为何破裂.
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