请教大全817题

nickynicky

817. The report on the gross national product—the nation’s total production of goods and services—showed that second-quarter inflation was somewhat lower than a previous estimation and the savings rate slightly higher.
(A) a previous estimation and the savings rate slightly higher
(B) a previous estimation and with a slightly higher savings rate
(C) a previous estimate and that the savings rate is slightly higher
(D) previously estimated and a slightly higher savings rate
(E) previously estimated and that the savings rate was slightly higher
正确选项D中是否省略了什么（好比说WHAT引导词等）？
我记得LZM的解释是说previously estimated是固定用法，找了半天没有找着。
谢谢！

诡异儿

我也记得说是习惯用法，没办法，没道理可讲的，记住就行了。

ballparks

就我在平时的阅读中，遇到的都是than previously estimated, 印象中没有见过

than waht previously estimated。

应该是习惯用法吧。

davidsfo

我不是说简单地加上一个WHAT，而是说THAN后面要跟名词性从句。
不过我总觉得这个习惯用法（如果是的话）总应该有个来历。