Only after I read the book _______ why she devoted all her life to medical work

题干

Only after I read the book _______ why she devoted all her life to medical work for
Chinese women and children.

A．I understood	B．had I understood
C．did I understand	D．I had understood

上一题下一题 0.85难度单项选择更新时间:2011-07-11 09:17:05

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