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
答案:B
解析:
解析:
|
此句是对当时的情形进行推断,所以要用must have been doing形式。 |
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