It is believed that _____ European scientist invented _______.
| A．an; a television | B．a; a television | C．an; the television | D．a; the television |
—Well, that was really a good meal. I _______ you were a really good cook.
—Thank you.
| A．didn’t know | B．don’t know | C．haven’t know | D．hadn’t known |
After he left college, he was employed in an international company
and there ever since .
| A．worked | B．has worked | C．had worked | D．was working |
—Where is Tom ?
—Well , he you here . Otherwise he would come down right now .
| A．didn’t know ; were | B．hasn’t known ; are |
| C．doesn’t know ; are | D．hadn’t known ; were |
All of the guests by 9 o’clock , but the host until 15 minutes later .
| A．arrived ; didn’t turn up | B．had arrived ; didn’t turn up |
| C．arrived ; hadn’t turned up | D．had arrived; hadn’t turned up |
Mike didn’t notice Alice entering his room. He ____ a phone call.
| A．answered | B．has answered | C．was answering | D．is answering |