2002-8-13&2002-8-30

13. The distinguishing feature of a fluid, in contrast to a solid, is the ease _____ .

(A) that a deformed fluid

(B) to deform a fluid

(C) when a fluid that is deformed

(D) with which a fluid may be deformed

答案是D.请问B为什么不对呢?

30. Of all the art-related reference and research library in North America, that of the laceName w:st="on">MetropolitanlaceName> laceType w:st="on">MuseumlaceType> of a Art in New York City is among the largest and most complete.

答案是A.请问B的that of 是什么结构呢?that怎么可以用在逗号后面呢？

1.道可道，非常道。a fluid is deformed with ease.

2.that前不用逗号，指的是它引导定语从句时，这里是代词。