His sister left home in 1998, and ______ since.
| A．had not been heard of |
| B．has not been heard of |
| C．had not heard of |
| D．has not heard of |
From her expression, we know that she didn’t understand the meaning．
| A．amazing | B．surprising | C．puzzled | D．satisfied |
—Have you finished your project, Cathy?
—Not yet．My computer．
| A．is still being fixed | B．is not fixing |
| C．has already been fixed | D．has not fixed |
Many of the students turned a deaf ear to his advice, they knew it to be valuable．
| A．as if | B．now that | C．even though | D．so that |
A great fire in our town last night and many people became homeless．
A
．broke through B．broke off C．broke out D．broke down
Under no circumstances and at no time __________be the first______ nuclear weapons.
| A．we shall; using | B．shall we; to use | C．shall we; used | D．we shall; using |