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：
