After Jack had sent some e-mails, he______ working on his project. (2012 .山东)
| A．had started |
| B．has started |
| C．started |
| D．starts |
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After Jack had sent some e-mails, he______ working on his project. (2012 .山东)
| A．had started |
| B．has started |
| C．started |
| D．starts |
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