题目内容
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?
解析:
此题考查虚拟语气。根据句意,我对这辆车和紧随其后的警车的速度不能确定,只能推测。“must have been doing” 表肯定,推测车速至少在每小时150千米。易错点:C项意为“本来能……(暗示实际上没能或没做)”。
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