问题
选择题
It was not until she came to see us ____ her mother was ill in bed.
A．when we knew
B．that did we knew
C．that we knew
D．that did we know
答案
答案：C
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It was not until she came to see us ____ her mother was ill in bed.
A．when we knew
B．that did we knew
C．that we knew
D．that did we know
答案：C