Miss Gao isn’t here. She _____ to the bus station to meet Mr. Brown.

A．go

B．has gone

C．has been

D．would go

汽车起动机具有电枢转速与电枢电流成反比关系及电枢转速与电磁转矩也成反比关系的特性。其中关键是由于电枢电流能起变化。