It was ____ I met Mr Green in Shanghai.
| A．many years that | B．many years before |
| C．many years ago that | D．many years when |
We were swimming in the lake _______ the storm started.
| A．when | B．suddenly |
| C．until | D．before |
She was walking down the road _______ she heard someone shouting for help.
| A．when | B．suddenly |
| C．until | D．before |
The fire went on for quite some time _______ it was brought under control.
| A．when | B．since |
| C．after | D．before |
He made a mistake, but then he corrected the situation _______ it got worse.
| A．until | B．when |
| C．before | D．as |
Someone called me up in the middle of the night, but they hung up ________ I could answer the phone.
| A．as | B．since |
| C．until | D．before |