来自刘晓冰的问题
1._____Millie______(visit)theGreatWallnow?2.You_______(notvisit)meforaverylongtime.3.Theroomisveryclean.Who_______it(clean)（是用过去式还是现在完成时呢?)
1._____Millie______(visit)theGreatWallnow?
2.You_______(notvisit)meforaverylongtime.
3.Theroomisveryclean.Who_______it(clean)（是用过去式还是现在完成时呢?)
