—Have you known Dr. Jackson for a long time?—Yes，since she ________ the Chinese
题型：不详难度：来源：
—Have you known Dr. Jackson for a long time?
—Yes，since she ________ the Chinese Society. | A．has joined | B．joins | | C．had joined | D．joined |
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答案
| D |
解析
| 答案 D [考查时态。主句用现在完成时，since引导的从句用一般过去时。] |
举一反三
The country life he was used to________greatly since 2002.| A．change | B．has changed | | C．changing | D．have changed |
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When I met him the other day，it was the first time we ________ each other since we were at school. | A．saw | B．had seen | | C．were seeing | D．have seen |
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—What"s that terrible noise?
—The neighbors ________ for a party.| A．have prepared | B．are preparing | | C．prepare | D．will prepare |
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| It is reported that 40 percent of the land in Brazil________covered with trees. |
Mr. Black________ Shanghai in a few days. Do you know when the earliest plane ________on Sunday? | A．leaves for；takes off | | B．is leaving for；takes off | | C．is leaving for；is taking off | | D．leaves for；is taking off |
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