I worked __3years ago.A.in hospital B.at hospital C.at a hospital以上三个答案有何区别?

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Iworked__3yearsago.A.inhospitalB.athospitalC.atahospital以上三个答案有何区别?Iworked__3yearsago.A.inhospitalB.

I worked __3years ago.A.in hospital B.at hospital C.at a hospital以上三个答案有何区别?
I worked __3years ago.A.in hospital B.at hospital C.at a hospital
以上三个答案有何区别?

I worked __3years ago.A.in hospital B.at hospital C.at a hospital以上三个答案有何区别?
正确答案:I worked at a hospital 3 years ago.
其他的没有了a 语法上不对:
I worked in a hospital,besides working on TV.
复数:I worked in hospitals,besides working on TV.
I worked at/in a hospital 3 years ago.
下面句子里重要的部分是patient+地方所以不用a :
Sometimes,the health of a patient in hospital may get worse suddenly.
My aunt was put in hospital after seizure.