discount are available ( ) senior citizens.选to for with from中的哪一个?

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discountareavailable()seniorcitizens.选toforwithfrom中的哪一个?discountareavailable()seniorcitizens.选tofor

discount are available ( ) senior citizens.选to for with from中的哪一个?
discount are available ( ) senior citizens.选to for with from中的哪一个?

discount are available ( ) senior citizens.选to for with from中的哪一个?
discount are available (to ) senior citizensbe available to适用于…….