I wasn't sure if he was really interested or if he _______polite .was just being

问题描述:

I wasn't sure if he was really interested or if he _______polite .was just being
我的问题是,用was不就可以吗,干嘛还要加being呀,这不重复了吗

I wasn't sure if he was really interested or if he _______polite .答案:A.was just being不能用was,因为句子成分就无法成立了.just being polite 与was构成系表结构.另外,用being polite 比单纯用polite更形象....