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    【题目】After Jack ________ some e-mails, he started working on his report.

    A. sends B. has sent C. had sent D. would sent

    【答案】C

    【解析】

    试题分析：考查动词的时态。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 : 考查动词的时态

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