---How long have you known the doctor ? ---_________he helped me three years ag
题型：不详难度：来源：
---How long have you known the doctor ?
---_________he helped me three years ago.| A．When | B．Before | C．Because | D．Since |
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答案
| D |
解析
试题分析： 考查连词辨析。A 当。时候；B 在之前；C 因为D 自从。句意 你认识这个医生多久了。自己三年前他帮我开始。上文提到现在完成，与since引导的一般过去时相呼应。故选D项。 |
举一反三
It’s very nice_________you __________ my parents your best wishes.| A．of; sending | B．of; to send | C．for; to send | D．for; sending |
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| ______ time goes by, China is getting stronger and stronger. |
Detective Lu thought that ________ Xie Yiming ________ Wang Gang were likely to kidnap Guan Fei, Guan Dawei’s son. | A．either, or | B．both, and | C．neither, nor | D．not only, but also. |
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| ______ he got ready to leave home, his parents came to his home. |
| There’s no doubt _______ Emily will be the hostess (女主持) of the New Year’s party. |
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