I forgot _____ a pen yesterday and bought another one today .A.to buy B.buying
问题描述：
I forgot _____ a pen yesterday and bought another one today .A.to buy B.buying
I forgot _____ a pen yesterday and bought another one today .A.to buy B.buying
说一下选什么和理由
答
选A
forget to do忘记要去做某事（没做）
forget doing 忘记已经做过某事了（已做）
I forgot _to buy_ a pen yesterday and bought another one today .
我昨天忘记去买钢笔了,今天去买了一支.