a 150-year history 还是 an 150-year history 当数字开头时,选a 还是 an?

a 150-year history 还是 an 150-year history 当数字开头时,选a 还是 an? He worked in a big history m____ last year. xx-year history前面为什么是+a/an的? 70-year history Chinese New Year History. a four-thousand-year history 与 four thousand years' history哪个对 my uncle is a history.he teaches us ___ history this year (china) China has a long ______A.history of 2000 years B.2000 years history C.history with 2000 years D.2000-year-old history 1.The year 1066 was a ____ year for England.(history)2.Our school has a ______ of about 100 year.(history) It is a schooi with a_ history. A.30 year*s B.30 years C.30-years D.30 -year Shenzhen is a very young city,( )the history of only about 30 year. Mr.Brown teaches_____ history this year.A.we B.us C.ours 填空 A big day in China's 5000 year history.这句话的意思是什么呀! China is an old country with a 5000-year history.（同义句）China is an old country with _____ _____ history. 根据首字母提示完成句子 china is a c() with a long history There are twelve m() in a year Dalian has a history of more than 100 years old.100 years 为何不能是 100-year ? 能不能教我做一道初二的英语题目?1949 is a s______ year in the history of China. In more rencent -------,like the year 2010,the whole world -------many important events.A.history;happened B.times;took place