It was not until I went through his paper that __________ what rapidprogress he had made in writing.
| A．had I found | B．did I find |
| C．I had found | D．I found |
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It was not until I went through his paper that __________ what rapidprogress he had made in writing.
| A．had I found | B．did I find |
| C．I had found | D．I found |
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