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    【题目】I’m sure he will help her if he ________ her.

    A.knowsB.will knowC.is to knowD.can know

    【答案】A

    【解析】

    考查动词时态。句意：如果他认识她，我相信他会帮助她的。分析句子可知，if引导的条件状语从句，主句将来时，从句一般现在时。故选A项。

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