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

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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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