2. 外语
  3. No sooner______ a paper on his latest research than he was asked to write another for a conference.

No sooner______ a paper on his latest research than he was asked to write another for a conference.

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问题 No sooner______ a paper on his latest research than he was asked to write another for a conference.
选项 A、he had finished
B、he finished
C、did he finish
D、had he finished
答案D
解析
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