They are waiting -----.A at the doctor B at the doctor's C. in the doctor d.in doctor答案是B.at the doctor和 at the doctor's的意思和区别是什么?in the doctor 和in doctor's,有这种搭配吗?

They are waiting ( ) the bus.They are waiting ( ) the bus stop.介词填空 they are waiting for their Mum划在they下面 Did you konw__at the bus stop?选项A.who are they waiting for B.whom they are waiting for C.whom they were waiting for They are waiting for the train?的英文翻译 Who are they waiting ___the bus stop (填什么） They are waiting什么us什么the bus stop. they ,for ,bus ,the,waiting,are,a 连词成句 （they are） waiting for the bus.画线部分提问 they,who,are,for,waiting ) 连词成句 They are waiting for their MUm.（提问） they are waiting for you为什么加ing They are waiting for Mary 用who对Mary提问. They are waiting for mary.用who对mary提问 They are waiting for their father _____(have) supper. They are waiting for you at the library是什么意思 Do you know ______ at the bus stop?whom they are waiting for B．who they are waiting C． whom are they waiting for D．who are they waiting They are waiting for a friend .改成一般将来时态 They are waiting for the bus?划线部分为：waiting kor the 对划线部分提问