RBS6601设备，一个MU最大可支持几个RRUS级联（）
A.4
B.6
C.7
D.5
参考答案：B
My brother_________ have a hat. [ ]
A. am not
B. dont
C.don't
D.doesn't
I was on the highway when this car went past followed by a police car. They ______ at the speed of
150 kilometers an hour at least. [ ]
A. should have been driving
B. must have been driving
C. could have driven
D. would have driven
