It has been 4 years _____ the earthquake happened in Wenchuan A．when B．since C．after D．w
Ithasbeen4years_____theearthquakehappenedinWenchuanA．whenB．sinceC．afterD．while...
It has been 4 years _____ the earthquake happened in Wenchuan A．when B．since C．after D．while
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| B |
| 本题为固定搭配：It have/has been +一段时间+since +一般过去时。故选B |
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