I was on the highway when this car went past followed by a police car. They ______ at least 150 km an hour.
| A．should have been doing | B．must have been doing |
| C．could have done | D．would have done |
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I was on the highway when this car went past followed by a police car. They ______ at least 150 km an hour.
| A．should have been doing | B．must have been doing |
| C．could have done | D．would have done |
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