The chairman was about to declare the conference open ____ the lights went all out.
| A．as | B．while | C．then | D．when |
相关试题
14．The forest guards often find campfires that have not been________completely.
| A．turned down | B．broken down | C．put out | D．put off |
13．Many medical scientists are racing__________time to find a cure for H1N1 as soon as possible.
| A．on | B．against | C．for | D．In |
12．Alice is kind, careful, energetic and has much experience of looking after children. In a word, she is very_______.
| A．comfortable | B．flexible | C．available | D．Reliable |
11．--- Where did Mary’s parents 
buy the beautiful souvenir?
--- It was in the same village_________they spent their holidays last year.
| A．that | B．when | C．as | D．Where |
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