67._____ he _____ that they _____ home tomorrow?

67._____ he _____ that they _____ home tomorrow?
A.Does… learn… would go B.Does… learn… will go
C.Did… learn… would go D.Did… learn… will go
为什么要选B,一般现在时不是表示经常发生的动作吗?
66.I _____to know if Mary_____ by train that afternoon.
A.want… would go B.want… will go
C.wanted… would go D.wanted… will go
为何这题要选C过去时？