I was on the highway when this car went past followed by a police car.They _______ at least 150 kilometers an hour.?
A．should have been doing
B．must have been doing?
C．could have done?
D．would have done?
B?
此題考查虛擬語氣。根據(jù)句意，我對這輛車和緊隨其后的警車的速度不能確定，只能推測�！癿ust have been doing” 表肯定，推測車速至少在每小時150千米。易錯點(diǎn):C項(xiàng)意為“本來能……(暗示實(shí)際上沒能或沒做)”。
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