Every possible means ________, but the teacher as well as the students ________ found a solution to the problem yet.
| A．has been tried; hasn’t | B．has tried; haven’t |
| C．have tried; haven’t | D．have been tried; hasn’t |
(2013·西安模拟)The man we followed suddenly stopped and looked as if
whether he was going in the right direction.
| A．seeing | B．having seen |
| C．to see | D．to have seen |
Not until I completed the form that half questions were not relevant to me.
| A．had I realized | B．I had realized |
| C．I realized | D．did I realize |
about this computer program, a huge amount of time and energy .
| A．Should I know; be saved |
| B．If I had known; can be saved |
| C．Had I known; would have been saved |
| D．Did I know; was saved |
Hearing the bell ringing, out .
| A．rushing the children | B．rushed the children |
| C．were rushing the children | D．the children rushed |
—Can I smoke here?
—No, at no time in the library.
| A．permits smoking |
| B．does smoking permit |
| C．smoking is permitted |
| D．is smoking permitted |