问题描述: it was hard to do与it was hard doing的区别 1个回答 分类:综合 2014-09-24 问题解答: 我来补答 it was hard to do这个句式,是以it做形式主语,真实主语是后面to do(不定式)部分至于第二种,我没见过,等高手解析一下 展开全文阅读