请选择DCBA'Q(Y2A,?1V1R9p0Q*G4M1b Don’t forget the day ______you were received into the Youth League.:e8_0n/?,g-w7t9I(V7S:n1\
A、 when:e8_0n/?,g-w7t9I(V7S:n1\
B、 that:e8_0n/?,g-w7t9I(V7S:n1\
C、 at which:e8_0n/?,g-w7t9I(V7S:n1\
D、 where:e8_0n/?,g-w7t9I(V7S:n1\