It has been 4 years the earthquake happened in WenchuanA. whenB. sinceC. afterD. while

发布时间：2020-08-21 01:33:42

It has been 4 years      the earthquake happened in Wenchuan
A. when
B. since
C. after
D. while

网友回答

A. when
(答案→)B. since
C. after
D. while
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
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