______ the news of his father's death, he burst into tears.A After hearing B On hearingC Having heard D While hearing这道题为什么选B,而不选其余几个选项,请分析一下,谢谢.

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______thenewsofhisfather''sdeath,heburstintotears.AAfterhearingBOnhearingCHavingheardDWhilehearing这道题

______ the news of his father's death, he burst into tears.A After hearing B On hearingC Having heard D While hearing这道题为什么选B,而不选其余几个选项,请分析一下,谢谢.
______ the news of his father's death, he burst into tears.
A After hearing B On hearing
C Having heard D While hearing
这道题为什么选B,而不选其余几个选项,请分析一下,谢谢.

______ the news of his father's death, he burst into tears.A After hearing B On hearingC Having heard D While hearing这道题为什么选B,而不选其余几个选项,请分析一下,谢谢.
on 加动词的ing形式,意思是“一.就”

On hearing等于When he heard

on:一……(就……)一听到父亲的死讯,他泪流满面。
while后面应该接从句,所以这里用不了。

就是看意思了,on hearing一听到。其他意思都不够贴切