The situation comedy has proved to a remarkably durable commercial television fo

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问题 The situation comedy has proved to a remarkably durable commercial television format.

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答案 to∧—be

解析译文：情景喜剧已经被证明是一种相当持久的商业电视形式。
分析：考查习语。“prove to be+名词”是固定结构，表示“证明是……”，此处缺be。

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