I shall never forget those years _________I lived in the country with the farmers.  

A. that              B. when            C. where            D. which

I shall never forget those years ____ I lived in the country with the farmers, ____ has a great effect on my life.

I shall never forget those years _______ I lived in the country with the farmers, ______ has a great effect on my life.

I shall never forget those years _______ I lived in the country with the farmers, ______ has a great effect on my life.

A．that; which                            B．when; which

C．which; that                            D．when; who

 I shall never forget those years ____ I lived in the country with the farmers, ____ has a great effect on my life.