It was not until she came to see us her mother was ill in bed.A. when we knewB. that did

问题补充：

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：

A. when we knew

B. that did we knew

(答案→)C. that we knew

D. that did we know

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