题目内容：

You didn't hand in your homework. Did you forget ______ it last night?
A.to do. B. doing.

优质解答

You didn't hand in your homework.Did you forget （A.to do） it last night?
你没交作业.你昨晚是不是忘记写了?
forget to do,忘记要做某事.而forget doing是忘记做过的事.这里要填的是前一种情况.