I have only one day left ___ traveling to Kunming and then flying back home.
| A．when | B．as | C．before | D．while |
—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 |
—Such a mistake could have been avoided.
—Unfortunately, he _______ the mistake again and again.
| A．repeated | B．would repeat |
| C．had repeated | D．would have repeated |
—Such a mistake could have been avoided.
—Unfortunately, he _______ the mistake again and again.
| A．repeated | B．would repeat |
| C．had repeated | D．would have repeated |