Don't turn on thr computer until you_________ A were allowed

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Don't turn on thr computer until you_________ A were allowed to B are all
Don't turn on thr computer until you_________
A were allowed to B are allowed to C were allowed D are allowed
个人觉得是选B 但是想不通为什么

=Don't turn on the computer until you are allowed to turn it on.
先说时态：应该用一般现在时表将来.
allowed to后面省略了不定式（不定式是主语补语）.如果选D,allowed后就不清楚是什么了.
又如：
I wanted to go out but my mother told me not to (go out).

Don't turn on thr computer until you_________ A were allowed 1.don't( )the paper on the floor.A.throw B.throwing C.to thr 翻译:You don't even need to know hoe to turn your computer on Please don't stand up in classs until you----- A were told t Young people aren't allowed ______in a bar until eighteen don't turn you back on don't get on the bus ()it has stopped A until B unless a friend wants to turn on the radio .you don't want him or h Don’t turn on the radio. Your father ______ now. A．sleeps B． Someone turn on the radio,____?A.will you B.does he C.don't Don't push.We should get on the bus_________. A.by turn B.to don't turn on the TV.Grandma __now A.is sleeping B.will slee