There is a train every ten minutes.划线部分为a 怎么提问

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There is a train every ten minutes.划线部分为a 怎么提问

There is a train every ten minutes.划线部分为a 怎么提问
There is a train every ten minutes.划线部分为a 怎么提问

There is a train every ten minutes.划线部分为a 怎么提问
How many trains are there very ten minutes?

改为; How many trains are there every ten minutes?