---What did your teacher say this morning?

--She asked me                 this morning.

A．how did Tom come to school

B．why was Tom late for school

C．when Tom would get to school

D．what will Tom do at school

已知某施工机械每班净工作时间为7h，该施工机械的台班利用系数为( )。

A．0.875

B．0.865

C．0.856

D．1.000