she's in his office for an interview为什么用for和an

she's in his office for an interview为什么用for和an betty's mother is in an office she is a ( ) she works in an office和she works in office哪个对 she works in an office和she works in office哪个错 she works in an office和she works in office哪个不对 It 's necessary to be prepared for a job interview( ) the an It’s necessary to be prepared for a job interview.___ the an What would be appropriate clothes to wear for an interview? She's got____"A"_____maths again A.an...with B.an...for C.an Where has mum()?She's ()for half an hour let's go for an outing 句中for是什么词?for an outing中为什么有an修饰outin A s_________is a person who works in an office,working for a