I spent twoMonths on the book. It ______ ______ twoMonths ______ ______ the book.

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问题 I spent twoMonths on the book.
It ______ ______ twoMonths ______ ______ the book.

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答案have been in,for

解析 用be in的现在完成时形式表示从过去某时开始的动作一直延续到现在或继续延续下去,另外完成时中通常用介词for引导表一段的时间状语。
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