题目内容：
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
参考答案：
选择题：I was on the highway when his car went past. He __
- 题目分类：中北大学大学英语（一）
- 题目类型：选择题
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A. should have been doing
B. must have been doing
C. could have done
D. would have done