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 |
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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 |
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