12. (单选题) __________ 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

12. (单选题) __________ 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

出自：延安大学-园林-大学英语4

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