His writing is so confusing that it's difficult to make out ________it is he is trying to express.
| A．that | B．how |
| C．who | D．what |
We first met on a train in 2010. We both felt immediately that We each other for years.
| A．knew |
| B．have known |
| C．had known |
| D．know |
They _on the programme 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 worked; were still working |
| D．have worked; are still working |
When the old man to walk back to his house, the sun itself behind the mountain.
| A．started; had already hidden |
| B．had started; had already hidden |
| C．had started; was hiding |
| D．was starting; hid |
--- Have you known Dr Jackson for a long time?
--- Yes, since she the Chinese Society.
| A．has joined |
| B．joins |
| C．had joined |
| D．joined |
He football for many years before he was twenty.
A was playing
B. played
C. has played
D. had played