一道英语难题:八年级及以上英语好的同学请进. The war brought our country much trouble and we were _____,though we didnot know whether it work or not. A.working it on B.working on it C.working out it D.working it out 原因是什么?
work out指“解决了” 用法是work out sth./work it(代词) out work on指“致力于解决” 用法是work on sth./work on it 从though we didnot know whether it work or not.可发现还没有解决,故用work on