i visited them once every six months的意思,还有另一种表达方式,用序数词~

i visited them once every six months的意思,还有另一种表达方式,用序数词~ This is the museum where I once visited改错 一篇英语作文：A place I once visited I visited my uncle once a week.对once 提问怎么说. 英语翻译请翻译 we visited it once a year with the school class I was in. I walk them in the park once a day.对once a day提问 The fatory which I visited yesterday was not the one where I once worked.那个为什么用where,which. When I visited them last night ,they __ (chat) by the fire. 英翻中一句话I shall have reviewed my lessons three times,if i review them once again you should feed them once a day.i think it important 合并成一句i think ___ ___important ____ _____ _______feed them once a day ( )do you write to your parents?I write to them once a month根据回答提问 Jack and his father were playing chess when I visited them at this time yesterday.改为被动句 the school ___ i visited last year was not the one ___ i once workedA.which where B.which which C.where which D.where where 59页94.The factory ------I visited yesterday was not the one ------I once worked A.which ,where B.which,which C.where ,which D.where ,where 为什么 59页94.The factory ------I visited yesterday was not the one ------I once worked A.which ,where B.which,which C.where ,which D.where ,where为什么 I was bitten by a dog once and I have been afraid of them since then.I was bitten by a dog once and I have been afraid of them ____ ____. What did you do last weekend I played football .How about you I visited my grandparents.Did you help them clean their room?Yes,I did.中文意思 -you once visited the town at 6-Really?I don't remeber____there at that time为什么这里要用被动 的being taken?