. Only in a foreign-funded enterprise the importance of learning English well.
A. when I worked, I realized
B. when I worked, did I realize
C. when did I work, did I realize
D. when did I work, I realized
网友回答
A. when I worked, I realized
(答案→)B. when I worked, did I realize
C. when did I work, did I realize
D. when did I work, I realized
解析：考查倒装句。当only位于句首时，主句用部分倒装，从句内容不受影响，故选B。