After Jack had sent some e-mails, he _______ working on his project. A. had started B. has started C...
2022-12-08 14:45:15 28次 2012-2013学年吉林延边二中高三第一次阶段性测试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
After Jack had sent some e-mails, he _______ working
on his project.
A. had started B.
has started C. started D.
starts
本题链接：
