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After Jack ________ some e-mails, he sta...

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

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

 

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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