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    精英家教网 > 高中英语 > 题目详情

    After Jack had sent some e-mails, he _______ working on his project.

    A．had started B．has started C．started D．starts

    C  

    解析试题分析：考查时态：句意：杰克发了几份电子邮件后，开始做他的课题。状语从句是过去完成时，开始做课题是过去发生的，才能构成“过去的过去”的动作，所以选C。
    考点：考查时态

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