they are sitting at a

they are sitting at a They are sitting __a table.A:down B:on C:at D:in ()their seats 用什么 ( at?on?with?down?)They are all sitting _________their seats 用什么 ( at？on?with?down?) Mike and his father are sitting at the table .They are having their lunch .I don't like this soup 3.They are all sitting ----their seats. They are sitting ( ) a table the park.括号里应该填哪个 A:on B:in C:along D:at _____ the trees some birds are singing.A.On B.At C.In They are sitting _____ a table.A.at B.near C_____ the trees some birds are singing.A.On B.At C.InThey are sitting _____ a table.A.at B.near C.in______(人,人类) hopes to land on the Mars one day Mr Green's family are sitting at the ___ ____dinner At which table are they sitting?该句与Which table are they sitting at?有何差别?类似的句子还有：For which traffic sign do I have to look out?From whom did you borrow it?都是病句吗? 为何句末介词不能省略?例如：Which table are they sitting (at)?There is a big box to pack all the clothes (in).Have you got a pen to sign these papers (with)?另外第一句可以这样改吗：At which table are they sitting?尤其迷惑 What are they good at? They are at the bus what they are staring at? Mike and his father are sitting at the table Mike and his father are sitting at the table.They are having their lunch.I don't like this soup.I don't want to drink it.says Mike and puts down the spoon.After lunch,Mike and his father work in the fiel there___a lot of people in the park every morning.(have.has,is,are)there are many visitors____on bus 919.(sit,sits,sitting,to sit)D___should be more careful when they drive at night. sitting at the table 是they at home还是they are at home为什么 they were sitting at the table ,talking as equals.中as equals的意思?如题