已知一个平面α，l为空间中的任意一条直线，那么在平面α内一定存在直线b使得[     ]

A、l∥b      

B、l与b相交    

C、l与b是异面直线  

D、l⊥b

I ______ go to bed______ my mother came back home.

A．won’t, until

B．didn’t, until

C．will, until

D．won’t,when