I regret you that my sister regretted out with you. You are not the kind of person she wants.
A. telling; going C. to tell; to go C. telling; to go D. to tell; going
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解析：考查固定用法。Regret to tell sth遗憾要做某事（动词往往是tell,say）；regret doing遗憾做过某事；句意：我很遗憾的告诉你我的姐姐后悔和你外出。