It has been 4 years _____ the earthquake happened in WenchuanA．whenB．sinceC．afte
题型：不详难度：来源：
It has been 4 years _____ the earthquake happened in Wenchuan| A．when | B．since | C．after | D．while |
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答案
| B |
解析
| 本题为固定搭配：It have/has been +一段时间+since +一般过去时。故选B |
举一反三
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