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 |
. She ought to stop work; she has a headache because she ____ all day long.
| A．has been reading | B．had read | C．is reading | D．Read |
. By the time I saw the angry expression on his face, I ____ what I was having to face.
| A．had known | B．have known | C．would know | D．Knew |
. — I’m sorry that I shouldn’t have been so angry with you.
— You ____ angry but that’s OK.
| A．have been | B．are | C．had been | D．Were |
. Johnson had made up his mind to give it up, but on ____ second thoughts he determined to try ____ third time.
| A．不填; a | B．不填; 不填 | C．a; a | D．the; a |
. What ____ great help the little girl is to her sick mother.
| A．不填 | B．a | C．the | D．An |