在句 The effect was far larger for female patients than it was for male ones 中，than it was 是不是 than what it was 的省略用法呢？将 than it was 替换成 than that 可以吗？
The effect was far larger for female patients than it was for male ones.
than it was 后面省略的是比较对应项 larger。它跟下面的句子在本质上是一样的：
Tom is far taller than he was last year.
