It was a three-hour journey 中的hour为什么不加S,不是复数要加S的吗?

It was _____journey.A three hour Ba three-hours C a three-hour Dthree hours 我搞不懂了.It was （ ）journey.A three— hourB a three hour c a three—hourd three hour It was a three-hour journey 中的hour为什么不加S,不是复数要加S的吗? It was three o'clock ten minutes ago.What will it be an hour's time? -How far is it from Nanjing to Shanghai?-It's over_ A、three hour's drive B、three hours'drive C、three hours'drives D、three hour drive It's three hours' drive from Beiijing to Shijiazhuang .three hours'drive同意短语A.a three- hour drive B three-hour drive The students will have it finished in_.A.three quarters of an hour timeB.three quarters of an hour's It is（three hours' drive ）from Shijiazhuang to Beijing.A.three—hours—drive B.three—hour drIt is（three hours' drive ）from Shijiazhuang to Beijing.A.three—hours—drive B.three—hour driveC.a three—hour driveD..a three—hour —driv He gave the taxi driver a—.A five dollar bill B five--dollars bill C five--dollar billD five dolls bill请求懂的人分析一下选项,问什么选c不选b啊?It took us long time to get there.It was ___journey.A three--hour B a three hour C a th it took us quite a long time to get there.it was___journey.A.three-hour B.a three hourC.a three-hour D.three hours我想问一下时间怎么表示 It's about ______ from here to there.A.three hours' drive B.three hour's drive C.three hours hours drive D.three hours drive It's about ( ) walk.A.three-hour B.three-hours C.three-hours' D.three-hours's给讲讲吧.谢谢! It is over _____from Shijiazhuang to Beijing.A.three hours’ drive B.three hour’s driveC.three hours’ drives D.three hours drive 73.It is over_____from Shanghai to Nanjing.A.three hours'drive B.three hour's drive C.three hours'drives D.three hours drive 1.It's over __________ from Shijiazhuang to Beijing. A.three hours' drive B.three hour' drive C.three hours' drives D.three hours drive It took us ----to finish this work.A .three hour and a half B.three and a half hour C. three and half hours D.three and a half hours 详细讲解一下 为什么 three—hour 前要加“a” 英语翻译The train was about three-quarters of an hour from its destination and was travelling at a good sixty miles an hour when Mr.Harraby-Ribston,a prosperous businessman,rose from his seat,lifted his suitcase down from the rack and threw it ou