They _____ on the program for almost one week before I joined them and now we ____ on it as no good results have come out so far.
| A．had been working ;are still working |
| B．had worked ;were still working |
| C．have been working ;have worked |
| D．have worked ;are still working |
.
By the time he realizes he ________ into a trap, it’ll be too late for him to do anything about it.
| A．walks | B．walked | C．had walked | D．has walked |
.
This photo of mine was taken ________ stood the famous high tower.
| A．which | B．where | C．in which | D．there |
.
________ was most important to her, she told me, was her family.
| A．It | B．This. | C．What | D．As |
.
The mail was ________ for two days because of the snow storm.
| A．held out | B．held off | C．held up | D．held down |
.
What lessons China can draw from________global financial crisis has become ________ hot topic among us students..
| A．the; a | B．不填; a | C．a; the | D．不填; the |