This is the most serious and worst situation ________ I have ever experienced as a fan of the NBA.
A. which B. when
C. that D. where
Nancy enjoyed herself so much __________ she visited her friends in Sydney last year.
| A．that |
| B．which |
| C．when |
| D．where |
Peter was so excited __________ he received an invitation from his friend to visit Chongqing.
| A．where |
| B．that |
| C．why |
| D．when |
You can't borrow books from the school library __________ you get your student card.
| A．before |
| B．if |
| C．while |
| D．as |
She had just finished her homework __________ her mother asked her to practise playing the piano yesterday.
| A．when |
| B．while |
| C．after |
| D．since |
The girl had hardly rung the bell __________ the door was opened suddenly, and her friend rushed out to greet her.
| A．before |
| B．until |
| C．as |
| D．since |