两个互为相反数的有理数相乘，积为　 [ ]

A． 正数

B． 负数

C． 零

D． 负数或零

I watched the football match last night and ____ go to bed ____ 11 0'clock.  [ ]

A. don't; when        

B. didn't; as  

C. don't; until        

D. didn't; until