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The window which hasn't been cleaned for at least 3 weaks re

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The window which hasn't been cleaned for at least 3 weaks requires ____(clean)
并且分析这个句子成分,要翻译,我主要不懂hasn't been for 之后的.
The window which hasn't been cleaned for at least 3 weaks re
The window which hasn't been cleaned for at least 3 weaks requires (cleaning).
The window 主语
which hasn't been cleaned for at least 3 weaks 定语从句,修饰先行词the window
requires 谓语
cleaning.动名词做requires的宾语.
定语从句的分析:
which 关系代词做定语从句的主语(which=The window)
hasn't been cleaned 谓语
for at least 3 weaks 介词短语做时间状语