The days ______ we worked together cannot be easily forgotten.
A: that
B: when
C: which
D: at which
                    A: that
B: when
C: which
D: at which
举一反三
- The days ________ we spent in Tokyo together will never be forgotten. A: when B: which C: who D: on which
 - ( ) 9. I'll never forget the days ______ we spent together in the countryside. A: when B: on which C: which D: in which
 - I’ll never forget the days ______ I worked together with you. A: when B: where C: which D: that
 - We will never forget the days()we lived in the countryside with the farmers,()has a great effect on his life. A: that;which B: when;which C: which;that D: when;who
 - I cannot forget the days()I lived in the countryside. A: where B: that C: when D: which
 
