how did you know the news I heard it _the radio.a,on b,from并说明理由

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how did you know the news I heard it _the radio.a,on b,from并说明理由
how did you know the news I heard it _the radio.
a,on b,from并说明理由

how did you know the news I heard it _the radio.a,on b,from并说明理由
选A
hear from的意思是 收到...的来信
此处明显不是,故排除B

from
hear..from从...听说

I heard it on/over the radio.
祝你进步!

from!
怎么可能选A?!?!