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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1234

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.before D.unless
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Thegovernmenthastakensomemeasu