问题描述: You should ______(hand) in your exercise book first(根据句意用所给单词的适当形式填空) 1个回答 分类:英语 2014-10-20 问题解答: 我来补答 You should hand in your exercise book first.这句是说还没交也可以是You should have handed in your exercise book first.这后一句是已经交过了,但你本该先交 展开全文阅读