某计算机系统的CPU主频为2.8GHz。某应用程序包括3类指令，各类指令的CPI(执行每条指令所需要的时钟周期数)及指令比例如’下表所示。执行该应用程序时的平均CPI为（ ）；运算速度用MIPS表示，约为（ ）。
A.25
B.3
C.3.5
D.4
A.700
B.800
C.930
D.1100
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