Peter is busy __ at school but he never forgets _ exercise every day.A. working; doing B

问题补充：

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：

解析：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。