一道GMAT语法题thereportonthegrossnationalproduct---thenation'stotalproductionofgoodsandservices---showedthatsecond-quarterinflationwassomewhatlowerthanapreviousestimationandthesavingsrateslightlyhigher.(a)apreviou

Question

一道GMAT语法题
the report on the gross national product---the nation's total production of goods and services---showed that second-quarter in flation was some what 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
我想知道原理是啥?

Answer 1

showed是谓语,showed后面接两个分句.GMAT最讲究平行结构,原句中是showed that + 分句 and 填空.所以and后要接一分句保持平行.分句应以that开头,这在GMAT中很常见.主句是过去时,第一个从句也是过去时,所以第二个从句应该用过去时.所以选E.