Not until I went through his paper what rapid progress he had made in writing.A. I did fi

问题补充：

Not until I went through his paper what rapid progress he had made in writing.

A. I did find

B. did I find

C. I had found

D. was I found

答案：

A. I did find

(答案→)B. did I find

C. I had found

D. was I found

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