单选题 Tom regretted (to blame) his sister (for) the mistake, for he later found it was his own fault.
A. to blame B. for C. later D. own

【正确答案】 A
【答案解析】应改为blaming。 regret doing表示对已做过的事后悔，而regret to do表示很遗憾，但必须做某事。