It takes a long time to go there by train中time不可数为什么前面还能加a?

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It takes a long time to go there by train中time不可数为什么前面还能加a?
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It takes a long time to go there by train中time不可数为什么前面还能加a?
It takes a long time to go there by train中time不可数为什么前面还能加a?

It takes a long time to go there by train中time不可数为什么前面还能加a?
a long time 强调的是一段时间,如 an hour,two weeks ,five years等等,hour ,week 和year 都是可数名词,所以用a long time.

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