求下列英语题目的答案及其语法1、The moment I got home ,I found I ___ my jack

求下列英语题目的答案及其语法
1、The moment I got home ,I found I ___ my jacket on the playground.
A had left B left C have left D was leaving
2、 Not until the motorbike looked almost new ____ repairing and cleaning it.
A he stopped B did he stop C stopped he D he did stop
3、---What sort of house do you want to have something big
---well,it ____be big
---that is not important.
A must not B need not C can not D will not