—Have you ever read The Brief History of Time?

—Yes．While in Britain，I ______it a couple of times．

A．have read       B．would read          C．had read         D．read

—Have you ever read The Brief History of Time?

　 —Yes . While in Britain ,I ____ it a couple of times.

　 A．have read B．read　 C．had read　 D．was reading