they have been to the summer palace only once(only once划线提问)

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they have been to the summer palace only once(only once划线提问)
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they have been to the summer palace only once(only once划线提问)
they have been to the summer palace only once(only once划线提问)

they have been to the summer palace only once(only once划线提问)
how many times they have been to the summer palace?

How many times have they been to the summer palace ? only once表示的是次数,若对once提问用how often

how often have they been to the summer palace