脊髓前动脉大多由哪支动脉发出（）。

A.椎动脉

B.基底动脉

C.小脑后下动脉

D.小脑上动脉

E.大脑后动脉

She wanted to know  ________    [ ]

A. why didn't I think it was a good idea    

B. why I didn't think it was a good idea    

C. why I thought it wasn't a good idea    

D. why did I think it wasn't a good idea