.---How much do you know about the 3D film technology？----A little , not until _

题干

.---How much do you know about the 3D film technology？
----A little , not until ____the hot movie Avata_____some about it.

A．did I see, did I begin to learn	B．I saw ,I began to learn
C．I saw, did I begin to learn	D．did I see, I began to learn

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