we all have such a feeling that when we hold positive attitude towards a world,

问题描述:

we all have such a feeling that when we hold positive attitude towards a world,
首先这句能用过去式吗 we all had such a feeling 可以吗 ,二 world前面为什么用a 而不是the

主从都要用过去式才协调.
a world不是独一无二的世界.a world���Ƕ�һ�޶������硣 ʲô��˼������������ڵ�������硣����˵������������ʡ�