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 |
相关知识点
推荐套卷
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 |