问题
How much do you know about the 3D film technology?–A little. Not until ____the hot movie Avatar ____some about it.
A:did I see ,did I begin to learn
B:egan to learn
C:I saw, did I begin to learn
D:did I see, I began to learn
B:egan to learn
C:I saw, did I begin to learn
D:did I see, I began to learn
正确答案是：
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