____ for a bus, I was reading a magazine.A．While was waitingB．While I waitingC．W
题型：不详难度：来源：
____ for a bus, I was reading a magazine.| A．While was waiting | B．While I waiting | C．While I am waiting | D．While waiting |
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答案
| D |
解析
| 有些时间状语从句中的谓语动词如果有动词be，主语又与主句的主语一致，或主语是it是，则从句的主语和谓语的一部分（特别是动词be）常常可以省略。 |
举一反三
| ___ the clock structk twelve. I got home with my brother. |
Being League members, ___ we ought to work hard at our lessons;___ we ought to take an active part in social activities.| A．on one hand…on other hand | B．on the one hand….on the other hand | | C．on the one hand…on the other | D．B and C |
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___ you know the rules of swimming, you will be able to swim well. | A．Before | B．While | C．Though | D．Once |
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It looks ___ it is going to rain.| A．like | B．as | C．as if | D．even if |
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___ happens, we’ll carry on the experiment.| A．Wherever | B．Whatever | C．Whenever | D．Whoever |
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