We are having a class get-together. It’s been twenty years we graduated f
题型：不详难度：来源：
We are having a class get-together. It’s been twenty years we graduated from high school. | A．before | B．since | C．after | D．when |
|
答案
| B |
解析
| 考查句型：It is/has been+时间段+since后用一般过去式，自从什么时候起已有一段时间了。故选B。 |
举一反三
Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.| A．so that | B．in case | C．even if | D．as though |
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_______ ninety-nine percent of the panda’s diet is bamboo, it also eats corn,
apples and sweet potatoes.| A．If | B．While | C．Because | D．Since |
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_____ computers are convenient to us in daily life, it may also cause other problems.| A．Whether | B．Because | C．As | D．While |
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Betty shows great interest in this poem now, but she thought it boring she read it.| A．at the first time | B．the first time | | C．for the first time | D．at first |
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| I had been puzzled over the problem for over an hour without any result, all at once a solution flashed across my mind. |
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