The government has taken some measures to solve the shortage of electricity, but
题型：不详难度：来源：
The government has taken some measures to solve the shortage of electricity, but it may be some time _______ the situation improves. | A．since | B．when | C．unless | D．before |
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答案
| D |
解析
| 考查连词用法。“It be+一段时间+before…”是固定结构，该结构的意思是“要过……（长）时间才……”。when“．．．．．．的时候”；since“从．．．．．．开始”；unless“除非”；根据题意D最佳。 |
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