While I was in the university,I learned taking a photo,____ is very useful now for me.A、 it  B、 which  C、 that  D、 what 

While I was walking in the street,I met Liu Dehua.转化为I met Liu Dehua while I was walking in the street.while换when, cooking,while,I,dinner,the,was,he,working,was,garden,the,in连词成句 英语翻译Tom worked in the garden while I was sitting in the sun. 求翻译：While i was hanging a painting,i saw the crack in the wall. While the alien was in the museum,I called the TV station.是个什么句子? While the alien was in the museum,I called the TV station .Isn't that amazing! the was i while was cooking in garden boy in the kitchen planying the组句、快 I happened_(meet)one of my old friends while I was walking in the street 给my wife is cooking while I was working in the garden.找错 I saw an accideng_____i was walking in the street.------中选 while before after until while是否只可以跟过去进行时?如,While I was cooking the dinner,he set in the dining room.可不可以I was cooking the dinner,while he sat in the dining room. While I was cooking the dinner,he was working in the garden.While 和When 有什么不同?顺带翻译一下. While I was walking in the street,I met Liu Dehua.可不可以转化为I was walking in the street,while I met Liu Dehua.后半句中应用while还是when?转化为I was walking in the street while I met Liu Dehua. While I was walking down the street,I saw a cat in the tree 改为同义句 I was preparing______the coming contest while my mother was preparing_____supper in the kitchenA./,forB.for,/请说明原因 WHILE I WAS DRIVING ALONG THE RIVER,I FOUND SOMETHING STRANGE IN THE WATER近义句 I FOUND SOMETHING STRANGE IN THE WATER_______ ________ALONG THE RIVER,急 I often visited the British Museum ______ I was staying in London.A、until B、while C、during D、th While I was in the university,I learned taking a photo,_______ is very useful now for me.选项:a