A:EeFf×Eeff
B:EeFF×Eeff
C:EeFf×eeff
D:EEFf×eeff
化简:ab-1+b-aa2-1=____ .
sin(﹣600°)的值是( )
小齐同学很喜欢看电视剧《封神榜》,当看到周文王在牧野战胜商纣王并建立了西周时他乐不可支。( )
—Why did the car hit the boy?
—Because the driver _________ on the phone at that time.