确定脊柱侧弯角度测定Cobb角应该使用（）。

A.脊柱X线片

B.脊柱CT片

C.脊柱MRI片

D.脊柱USE片

E.脊柱波纹照片

I forgot to return the book to you yesterday. So I（）today.

A.might do it 

B.must do it

C.had to do it

D.must have to do it