only a quarter of an hour left

only a quarter of an hour left a quarter of an hour是什么意思? Fifteen minutes is a quarter of an hour可不可以用Fifteen minutes is quarter an hour这样说 more than a quarter of house in britain have only got one person in them. 英语中a quarter of an hour中的an能换成one吗 （新概念4）第35课：下面这句中的“ to travel the quarter of a million miles from the Moon to ..Because the Moon has only an eightieth of the Earth's mass,it requires 97 per cent less energy to travel the quarter of a million miles from ●●●●●一道英语选择题6●●●●●13The vegetable market is_____walk from our school.A.a quarter of an hours' B.a quarter-of-an-hour'sC.a quarter of an hour's D.a quarter-of-an-hours'请问为什么选C a quarter of a pound of three quarter of a book为什么quarter没用复数 可以说a quarter an hour吗 可以说a quarter an hour吗 一刻钟怎么说?有的说是 a quarter,有的说是 a quarter of an hour,有的说是 quarter,到底哪个是正确的在句子中运用的时候怎么才能知道什么时候用 a quarter,什么时候用 a quarter of an hour呢? the a ;a the;the thehe walked ( )whole day ,but by 5:30 he only covered()quarter of the distance a quarter of a million Maoris, 求电子书:A Quarter Century of Unix It is difficult that we finish writing the composition in a quarter of an hour.同意句转化!_____ difficult_______ _________finish writing the composition in a quarter of an hour. It is difficult for us to finish writing the compositionin a quarter of an hour.啥意思RT per cent 和percent 的区别?because the moon has only an eightieth of the earth's mass,it require97 per cent less energy to travel the quarter of a million miles from the moon to earth-orbit than the 200 mile-journey from earth's surface into orbit