After Jack had sent some e-mails, he _______ working on his project.A．had starte
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After Jack had sent some e-mails, he _______ working on his project.| A．had started | B．has started | | C．started | D．starts |
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答案
| C |
解析
| 考查动词时态。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。句意：Jack发了几份电子邮件之后，他才开始研究他的项目。 |
举一反三
The manager was concerned to hear that two of his trusted workers ______. | A．will leave | B．are leaving | | C．have left | D．were leaving |
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"Life is like walking in the snow", Granny used to say, "because every step ”| A．has shown | B．is showing | | C．shows | D．showed |
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I had been working on math for the whole afternoon and the numbers before my eyes.| A．swim | B．swum | | C．swam | D．had swum |
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--Well, it wasn’t me. I didn’t do it.| A．is cleaning | B．was cleaning | C．has cleaned | D．had cleaned |
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