定语从句 能不能把为什么选这个的原因告诉我

定语从句 能不能把为什么选这个的原因告诉我
1.the day___she spent with us was never to be foregtten.
A./ B.on which C.which D.in which
the day___she play with us was never to be foregtten
A.that B.when C.which D./
2.She brought forward a plan__we couldn't agree.
A.that B.which C./ D.to which
She brought forward a plan__we couldn't accept.
A./ B.for which C.to which D.of which
3.The invention__she spent 2 years will do well to the world.
A.which B./ C.on which D.when
The invention__took her 2 years will do well to the world.
A.which B./ C.on which D.it