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Some shops open _____10a.m.and 3:30p.m.during the Spring Fes

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Some shops open _____10a.m.and 3:30p.m.during the Spring Festival holidays.
A.at B.between C.from D.among
为什么不能选B要选A?
应当用 B.between.open between 10a.m.and 3:30p.m 表示时段,10点到下午3点开着.
at 是 时间点,精确的时刻.at 10am 就是 10点这个时刻.
除非是 at midnight on Christmas Eve.这个 at 是 night 的要求.
具体钟点,不能 at 10am and 3:30pm.
商店 open 常用
open 10am - 3:30pm,
open 10am to 3:30pm,
open 10am through 3:30pm,
open from 10am to 3:30pm,
是否答案有误.