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

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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 come by sth.固定短语搭配,意为“获得,得到”。A选项:获得,得到。B选项:解释。C选项:理解。D选项:看出,分辨,察觉。
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