问题描述：
I ____________ to learn French in 2001,and I __________it for 9 years.
A.began,have been learning B.begin,learnt C.began,am learning
为什么选C,A错在哪?
A.began,have been learning B.begin,learnt C.began,am learning
为什么选C,A错在哪?
问题解答：
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