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when the traffic accident took place.  A.He happened to be p

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when the traffic accident took place.  A.He happened to be passing by   B.It so happe
)______ when the traffic accident took place.
  A.He happened to be passing by
  B.It so happened to him to be passing by
  C.It so happened for him to be passing by
  D.He happened that he was passing by
为什么
when the traffic accident took place.  A.He happened to be p
A.happened to 意思是碰巧干sth.因为后半句没有主语,因此前半句必须要是一个有主语的小句,when连接两部分.综上所述:A为正确答案.