In the global economy, a new drug for cancer, _________ it is discovered, will create many economic possibilities around the world. 

A. whatever                B. whoever          C. wherever        D. whichever

 In the global economy, a new drug for cancer,           it is discovered, will create many economic possibilities around the world.

A. whatever         B. whoever       C. wherever     D. whichever

In the global economy, a new drug for cancer,        it is discovered, will create many economic possibilities around the world.

A. whatever               B. whoever                C. wherever                        D. whichever

In the global economy, a new drug for cancer, ______ it is discovered, will create many economic possibilities around the world.

A．whatever         B．whoever          C．wherever         D．whichever

 In the global economy, a new drug for cancer, ______ it is discovered, will create many economic possibilities around the world.

A. whatever            B. whoever           C. wherever          D. whichever