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
科目：高中地理 來源： 題型：
It was ______ the old worker came that we______ the experiment.
A．until；didn’t begin B．not until; began C．until; began D．not until; didn’t begin
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