she imagined_walking_(walk) into the office and _handed__(hand)in her resignation
imagin dong sth固定搭配
hand与主句的谓语动词imagined时态一致,加ed但是这样的意思的话，hand in her resignation就不是她imagined的内容？对不起，楼主，经查实。。我的答案是错的。应该用handing ，因为这个属于并列结构，要与walking保持一致。很抱歉！我有罪