问题补充：
You must apologize her what you have done.
A. /; for
B. for; to
C. to; /
D. to; for
答案：
A. /; for
B. for; to
C. to; /
(答案→)D. to; for
解析：考查固定短语：apologize to sb for sth 因某事向某人道歉，句意：你必须因你所做的事情向她道歉。所以选D。
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