问题
选择题
Peter is busy _ _ at school, but he never forgets _ __ exercise every day.
A. working; doing B. working; to do C. at work; doing
答案
答案：B
题目分析：句意：彼得在学校忙于工作但他从来不会忘记每天锻炼。be busy doing sth,忙于做某事。forget to do sth,忘记做某事。故选B。