I worked __3years ago.A.in hospital B.at hospital C.at a hos

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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.

I worked __3years ago.A.in hospital B.at hospital C.at a hos Her grandfather is sick __.A in a hospital B at the hospital he was taken ( )hospital.A.at the B.to C.in D.in 英语翻译Many years ago,when I worked at Stanford Hospital,I got the hospital is just over there,()the road A:across B:at C:i works at a hospital in Shenyang和she works in a hospital in S I am a doctor at the London hospital .at the London hospital she works at a hospital in Shenyang和she works in a hospital 翻译短文Mr. Johnson worked in a hospital. Three years ago, when 区别in the hospital 和at hospital in hospital 和 at hospital 的区别英语改错题,My classmate,Joseph,is at present in hospital with a b