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【题目】After Jack had sent some e-mails, he _______ working on his project.
A.had started
B.has started
C.started
D.starts

【答案】C
【解析】句意:Jack发了几份电子邮件之后,他才开始研究他的项目。根据前半句的谓语动词用了过去完成时,可知后半句用一般过去时,这样才能符合“过去的过去”这一条件。故选C。

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