They____on the program for almost one month before l was arranged to help them. Now, we____on it as no result has come out.
| 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 |
It was not _____ she took off her glasses _____ I realized she was a famous film star.
| A．when , that | B．until , that | C．until , that | D．when , then |
Does ______ matter if he can’t finish the job on time?
| A．this | B．that | C．he | D．it |
I don’t think ____ possible to master a foreign language without much memory work.
| A．this | B．that | C．its | D．it |
Is ____ necessary to complete the design before National Day?
| A．this | B．that | C．it | D．he |
Was it during the Second World War_____ he died?
| A．that | B．while | C．in which | D．then |