英语18.To reach the top of the building ,you have to climb 18 _______ of _______.18.To reach the top of the building ,you have to climb 18 _______ of _______.a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair为什么

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英语18.To reach the top of the building ,you have to climb 18 _______ of _______.18.To reach the top of the building ,you have to climb 18 _______ of _______.a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair为什么

英语18.To reach the top of the building ,you have to climb 18 _______ of _______.18.To reach the top of the building ,you have to climb 18 _______ of _______.a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair为什么
英语18.To reach the top of the building ,you have to climb 18 _______ of _______.
18.To reach the top of the building ,you have to climb 18 _______ of _______.
a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair
为什么

英语18.To reach the top of the building ,you have to climb 18 _______ of _______.18.To reach the top of the building ,you have to climb 18 _______ of _______.a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair为什么
d.flights;stair

flight表示一段楼梯，是可数名词。stair是一阶楼梯，也是可数名词。所以选b

选B，好像是习惯用法，在正规的英文字典和外国网站上都有一样的例句，前后都是复数

B,18段FLIGHTS,而每个FLIGHTS有很多STAIRS

the first people to reach the top of qomolangam这里to reach 不懂,也不是不定式,是英语约定成俗用吗 英语：The plane will ___in Shanghai soon.Let's ____ to the airport.A get reach B reach arriveC arrive reach D arrive get make persistant efforts to reach the reach out to the host another She tried to reach the lowest () branch 英语arrive和reach的区别arrive和reach的区别,哪一个加地点,哪一个不加Who was the first one to 填arrive还是reach 英语词性转换：He was ___ to reach the top of the mountian.（hundred) the apple is difficult to reach.------is------to reach the apple.the apple is difficult to reach.------is------to reach the apple.he is too young to go to school now.he is-----old------to go to school now. reach out to造句, to reach a unable to reach internet 英语18.To reach the top of the building ,you have to climb 18 _______ of _______.18.To reach the top of the building ,you have to climb 18 _______ of _______.a.flight;stairs b.flights;stairs c.flight;stair d.flights;stair为什么 reach the station还是get to the station? It's easy to reach the books on the bookshelf. arrive to the conclusion和reach the conclusion哪个正确 The hurricane_____( prediction) to reach the coast tomorrow morning arrive on the moon还是reach to the moon Tom is always the first student ________ the class.reach?to reach?