13．Not until I was a senior studentthe importance of English.A. I have realizedB. did I re

问题补充：

13．Not until I was a senior studentthe importance of English.

A. I have realized

B. did I realize

C. have I realized

D. I realized

答案：

A. I have realized

(答案→)B. did I realize

C. have I realized

D. I realized

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