问题
选择题
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
答案：B
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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：B