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那请问那个when是时间状语从句吗?整个句子的主干是to imagine a time is difficult

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那请问那个when是时间状语从句吗?整个句子的主干是to imagine a time is difficult
如题
It is difficult to the point of impossibility for the average under the age of forty to imagine a time when high quality art criticism could be found in most big city newspapers.
那请问那个when是时间状语从句吗?整个句子的主干是to imagine a time is difficult
It 作形式主语,句子真正的主语是to imagine a time
to imagine a time is difficult 是句子的主干.when是时间状语从句.