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8.After Jack had sent some e-mails,he _______ working on his project.(  )
A.had startedB.has startedC.startedD.starts

分析 句意为:Jack发了几份电子邮件之后,他才开始研究他的项目.

解答 答案:C
根据句中的两个动作的时间先后和前句中的after判断,start的动作应该是在send之后,send是"过去之过去"的动作,所以后面的动作应该用一般过去时.

点评 判断两个动作的先后,首先要根据连词如after,before,by the time…等,然后根据句意进行判断.

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