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题目内容
（中北大学大学英语（一））
I was on the highway when his car went past. He ____ at least 150 kilometers an hour.
A. should have been doing
B. must have been doing
C. could have done
D. would have done
A. should have been doing
B. must have been doing
C. could have done
D. would have done
参考答案
