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On a rainy day I was riding my bike to pick up my son ___ a

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On a rainy day I was riding my bike to pick up my son ___ a terrible accident happened ahead.
A.who B.which C.while D.when
求详解.
who和which引导定语从句,这里不对
when“当……时”,while也有这个用法,但是我觉得应该用while,两者的区别你可以看看http://zhidao.baidu.com/question/4586492.html