i regret__that i'm unable to help youa.sayingb.to sayc.say

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i regret__that i'm unable to help youa.sayingb.to sayc.say
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i regret__that i'm unable to help youa.sayingb.to sayc.say
i regret__that i'm unable to help you
a.saying
b.to say
c.say

i regret__that i'm unable to help youa.sayingb.to sayc.say
B
regret to do 对要做的事遗憾