请帮我回答这个问题：1.How old is the Great Wall?

请帮我回答这个问题：1.How old is the Great Wall? 请帮我回答这个问题：1.How long did it take to build the Great Wall of how old is the Great Wall? “How old is the Great Wall”这句话是什么意思? Great wall,old,is,how,the 连词成句 how long is the great wall?怎么回答 请帮我翻译一个句子the Great Wall of China is the only structure that How long is the Great Wall How about going to The Great Wall?怎么回答? How long is the Great Wall?It's about( )( ) ( ) 马克思主义,请帮我回答这个问题 请帮我用英语回答这个问题～