They are sitting()to the window A.closing B.near C.nearing D.closed选B,为什么?

they are sitting at a 3.They are all sitting ----their seats. They are sitting _________ the window A.closing B.near to C.nearing D.opposite They are sitting--------to the window.A.closing B near C.nearing D.closed they are sitting （ ） to the window Acloseing Bnear cnearing dclosed They are sitting()to the window A.closing B.near C.nearing D.closed选B,为什么? Half of all seven year olds are sitting for up tHalf of all seven year olds are sitting for up to seven hours a day -almost half the time they are wake _according to shocking figures 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 Ann and her mother are going to the Great Wall on a Sunday morning.It is a fine morning.They are sitting in a big bus.Many people are in the bus,they are from different countries.Some are Americans and some of them come from England.They all want to _____ 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 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? they are sitting on the sofa _____(comfortable)___________(watch) tv They are sitting under a tree reading books.这里动词是什么?句子结构是什么样的 They are sitting __a table.A:down B:on C:at D:in 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. 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 grammar tensethe two gray cats sitting by the trash can belong to a neighbor为什么这里没有are sitting 1.thety don't go to school.ther parents__at work.A.aren't B.don't2.they are sitting __a tree.A.to B.under C.at D.on