After Jack had sent some e-mails, heworking on his project.
| A． |
had started |
B． |
has started |
C． |
started |
D． |
starts |
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After Jack had sent some e-mails, heworking on his project.
| A． |
had started |
B． |
has started |
C． |
started |
D． |
starts |
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