they have been to Beijing_twice_.(划线部分提问)

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theyhavebeentoBeijing_twice_.(划线部分提问)theyhavebeentoBeijing_twice_.(划线部分提问)theyhavebeentoBeijing_twic

they have been to Beijing_twice_.(划线部分提问)
they have been to Beijing_twice_.(划线部分提问)

they have been to Beijing_twice_.(划线部分提问)
How many have they been to Beijing?

how many times did they have been to BeiJing?

How many times have they been to beijing?