椎动脉和基底动脉的分布范围不包括（）。

A.脊髓

B.小脑

C.脑干

D.基底核

— Michael was late for Mr. Smith's oral class this morning.

— How come? ________ I know, he never came late to class. [ ]

A. As far as  

B. So far

C. By far  

D. As far