It's an _ride from here to the the museum.(hour)为什么填hour's,这不是单数吗

It's an _ride from here to the the museum.(hour)为什么填hour's,这不是单数吗 What's this () English?It's an egg.[in、on、from、to、for、at、under、with】 What's this?It's （ ）h.A.a B.an C.the D./ What letter is it?What's this letter?It's VIt's a VIt's an VWhat's this letter?It's UIt's a UIt's an UWhat's this letter?It's HIt's a HIt's an H为什么不能用It's V(U,H) It‘s an eraser. 英语翻译An animal from Africa.It eats meat.It usually sleeps and relaxes 20 hours a day.It's It's an ___ (hour) ride from here to the hospital.请说出原因 it is (an hour's bus ride) from my home to the museum.(提问） It's an hour ride from my home to the matket.错误之处 It's only about an h____flight from Qingdao to Beijing by air. It is ______walk from here to the bus station Ahalf-an -hour Bhalf an hour's 选哪个,为什么 Dear Mary,I went back from my h----yesterday. We were really e-----.Let me tell you somethingabout my trip.We w-----to Yangshuo.It is an ingteresting town and there's so much to do!First we r----bicyclrs from an employer and went bike riding into the It＇s from my It’s half an hour's walk from here to the bus station该句的结构 They play basketball (after school)对括号提问 It's (about an hour's walk) from here to school. it's about half an hour on foot from school to my home= my home is about an ____ _____ from school it is about an hour’s walk from my home to the zooit is about an hour’s walk from my home to the zoo（对划线部分提问）画线部分为an hour’s walk It's an hour's ride from here to the hospital.这里的it's做什么讲,句子的语法时态?