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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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