When asked to ______ the age of the antique, you need to have a special knowledge of the history.

A．It is a flashback of the tall buildings.
B．It is about the history of skyscrapers.
C．It is a comparison of skyscrapers.
D．It is a description of a skyscraper rac

A．began to build a monumental building together with Walter Chrysler
B．joined in the construction of a tall building along with Walter Chrysler
C．kept a secret of his own skyscraper while he joined Walter Chrysler
D．did not know how taller his building would be than Walter Chrysler's