800score模考中的一道语法题

colorseason

The new sports car is heavier than <usual> for a performance automobile, but it is exceptional because of its high-powered engine.

A) usual
B) it is usual
C) one usually is
D) is usual
E) has been usual

答案是D，但是我选了B。

joe11

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=114123&page=6

colorseason

看了之前的讨论，其实大家好像也没有弄明白究竟为什么有的时候是than usual，有的时候是than is usual。

如果than usual是习惯用语，那么than is usual的结构就让我挺费解的，因为后句的主语和前面的主语应该是不同的。

至于薰衣草所说的usual是形容词，不带有任何词性的歧义，所以可以直接使用than usual，为什么一个形容词可以代替整个名词主语出现呢？

还请大家继续指点

yuyingchao

这一题跟以下考古真题是一模一样的。

原句:The new sports car is a heavier car than is usual for a performance car…

是 The new sports car 和

a car is usual for a performance car 比较
a, car省略。than作为car的关系代词。
为什么不能选(B)，因为 it代替前面的the new sports car造成错误比较

The new sports car is a heavier car than the new sports car is usual for a performance。

以上供你参考，不对之处，请指正。

The Parthenon is larger than usual for a Doric temple, with eight columns on the short sides and seventeen on the long ones rather than the typical six and thirteen.
A) usual
B) is usual
C) has been usual
D) one usually is
E) it is usual

答案是 (B)