题目

如图，在矩形 中对角线 ， 交于点 ， 平分 交 于点 ，连结 .若 ， ，则 . 答案：【1】13 —You were brave enough to raise objection at the meeting. —Well, now I regret ________ that. A. to do B. to be doing C. to have done D. having done