As the Columbia Broadcasting System expanded its operations, soon become the largest radio network in the United States, it precociously recognized the potential for the rapidly evolving television broadcasting technology.

A:expanded B:become C:largest D:evolving

As the Columbia Broadcasting System expanded its operations, soon become the largest radio network in the United States, it precociously recognized the potential for the rapidly evolving television broadcasting technology.

A:expanded B:become C:largest D:evolving

As the Columbia Broadcasting System expanded its operations, soon become the largest radio network in the United States, it precociously recognized the potential for the rapidly evolving television broadcasting technology.

A:expanded B:become C:largest D:evolving

As the Columbia Broadcasting System expanded its operations, soon become the largest radio network in the United States, it precociously recognized the potential for the rapidly evolving television broadcasting technology.

A:expanded B:become C:largest D:evolving

One of the world’s (largest) salt mines (lie) directly (under) the (city) Detroit.（　）

A:largest B:lie C:under D:city