高一英语(改错)It was (not until) she (came to see) us that we (had known) her mother (was ill) in hospital.请写出错误的地方并改正,说明理由.

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高一英语(改错)
It was (not until) she (came to see) us that we (had known) her mother (was ill) in hospital.
请写出错误的地方并改正,说明理由.

C 应改为:knew
这是一个对时间状语从句进行强调的强调句,所叙述的一件发生在过去的事情,故主句中应用一般过去时,而不用过去完成时.