We went to the library in twos and threes,为什么用介词in

we went to the cinema. we went to the amusement we went to _____ the mountains We went to the Great Wall. We went to the British Museum是什么意思 We went to the countryside a___yesterday we went to the beach和we went to on the beach 的区别 Libra Libra We went to the hotel by the taxi 改错 we went to the mountains d------the summer vacation The __day,we went to the palace museum.(one) we went to the library yeaterday afternoon (went to the library 画线,提问) we went to the supermarket yesterday 怎么变一般疑问句? We went to the zoo.翻译成中文 to,by,we,hotel,taxi,the,went(.) [连词成句] we went to the Science Museum last Sunfsy We,went,to,the,zoo,last,Sunday.改为否定词