General acceptance of 3-D films may prove hard to come by, as the experience of

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问题 General acceptance of 3-D films may prove hard to come by, as the experience of three decades ago indicated.

选项 A、obtain
B、explain
C、understand
D、discern

答案 A

解析 obtain达到，得到。explain解释，说明。understand懂，了解。discern目睹，认识。come by来临，达到。

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