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.

I worked __3years ago.A.in hospital B.at hospital C.at a hospital以上三个答案有何区别? 英语翻译have i worked? I worked hard I guess it worked翻译 I wish I had worked harder是什么意思 i live in where i worked对不对 I worked out the problem so( )(easy) maybe i worked very very hard. maybe i worked very very hard. i worked so hard to find you . I get worked up 什么意思啊. I barely worked up a sweat RT I have worked 和 I had worked 各自的意思举几个类似的句子 ag. i worked hard to get what i have翻译 I believed on matter how hard i worked. The problem is too hard.I haven't ( )the answer A.WORKED ON B.worked for C.worked out D.worked off在括号中填选项 Ag+先和Cl-还是I-沉淀?