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题目内容
（延安大学-大学英语4）
__________ to realize how hard he worked on the book.(本题3.5分)
A、 Only then I came
B、 Only then did I come
C、 Only then do I come
D、 Then did I only come
A、 Only then I came
B、 Only then did I come
C、 Only then do I come
D、 Then did I only come
参考答案