. ---Is Bob still performing?

---I’m afraid not. He is said ______ the stage already as he has become an official.

A．to have left

B．to leave

C．to have been left

D．to be left

MIPS是衡量计算机（）的性能指标单位。

A、存储容量

B、存储速度

C、运算速度

D、缓存大小