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更换扼流变压器、中心连接板、轨道电路送、受电的扼流变压器引接线、站内横向连接线等器件时，应按规定采取相应的安全防护措施，保证（）畅通后，方可进行作业。
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【简答题】A．She will have to postpone her trip. B．She has already gotten her passport application. C．The passport office is closed. D．She was late in applying for her passport.
【简答题】When and where to go for the on-salary holiday ______ yet. A) are not decided B) have not been decided C) is not being decided D) has not been decided
【单选题】We’ve been told the good news, but when and where to go for the exciting paid vacation _______ yet.
A.
are not discussed
B.
have not been discussed
C.
is not being discussed
D.
has not been discussed
【简答题】A．She will have to postpone her trip. B．She has already gotten her passport application. C．The passport office is closed. D．She was late in applying for her passport.
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