1.I dontt knowwhen she （ ）,but when she（ ）,I will let you kn

1.I dontt knowwhen she （ ）,but when she（ ）,I will let you know.
A.arrives,will arrive
B.will arrive,arrives
C.arrives,arrives
D.will arrive,will crrive
2.I don't know if she ( )tomorrow.If she ( ) ,i'll call you.
A.comes,comes
B.will come,will come
C.will come,comes
D.comes,will come
最好说明为什么这样做