i visited the science m------ yesterday

I visited the summer palace是什么意思 I went to visited the museum. i visited the science m------ yesterday I visited the science m( )yesterday I visited the zoo.怎么问? It's the second time I ___China.A had visited B visited C have visited D visit The workers______(produce) shoes when I visited the pactory I()the Summer Palace tomorrowA visit B visited C am visiting D have visited 为什么Great Wall前要加the,Big Ben前不加the?I visited Big Ben.I visited the Great Wall. it has been the first time that i () sanya ,which is a great tourist attraction.A,should have visited B,visited C,had visited D.have visited I visited the museum last week(改为否定句) I、visited、have、the Great Wall、never连词成句 I have already visited the farm 改一般疑问句 This is the museum where I once visited改错 the,USA,I,never,visited,have怎么连词成句 排序组成句子 I,in,visited,China,the Great Wall this is the place___last year A,which I visited B.where I visited C,in which I visited选择哪个?其他为什么不对? this was the place__last year.A.which I visited B.where I visited搞不清什么时候用which什么时候用when