It was only when I read this story for a second time to appreciate its beauty.
A. did I begin
B. that I began
C. then I began
D. had I begun
网友回答
A. did I begin
(答案→)B. that I began
C. then I began
D. had I begun
解析：考察强调句型，“是在我又读了一遍这个故事我才欣赏到它的美。”答案B。