Luckily, all the students got out of the teaching building _ it fell down.
| A．until | B．before |
| C．since | D．While |
相关试题
The government should try to do ___________ to improve the food quality.
| A．nothing | B．anybody | C．something | D．somebody |
—What’s the matter, Linda?
—I have a toothache and I ____________ terrible.
| A．smell | B．feel | C．taste | D．sound |
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