问题描述：
简单句改为复合句,复合句改为简单句
1.I konw what I should do next
2.They want to know hao to learn is it
3.I undered whichu book i should choose
1.I konw what I should do next
2.They want to know hao to learn is it
3.I undered whichu book i should choose
问题解答：
我来补答展开全文阅读