题文
The government has taken some measures to solve the shortage of water, but it may be some time __ the situation improves.
| A．since | B．when. |
| C．unless. | D．before. |
推荐试卷
The government has taken some measures to solve the shortage of water, but it may be some time __ the situation improves.
| A．since | B．when. |
| C．unless. | D．before. |
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