can we use large memory model variables in Evaluation Keil

Yes.

http://www.keil.com/demo/limits.asp

But do note that it's not just variables that are affected by the Memory Model:

http://www.keil.com/support/man/docs/c51/c51_le_memmodels.htm

Yes.

http://www.keil.com/demo/limits.asp

But do note that it's not just variables that are affected by the Memory Model:

http://www.keil.com/support/man/docs/c51/c51_le_memmodels.htm