时态填空Could you tell me if you____the story book before?(read)

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答案是：have read
分析：IF 引导的宾语从句,BEFORE 常与现在完成时连用,现在完成时的结构是 have / has +动词的过去分词.（ READ的过去分词与原形相同）
加油!不明白再问!
再问： before在句中有时句子是一般过去时，我应该怎么区分时态呢
再答： before ‘ 以前’ 一般与现在完成时连用， before作为介词‘在……之前’ ，可用于一般过去时。

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