Don't turn on thr computer until you_________ A were allowed to B are allDon'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

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Don't turn on thr computer until you_________ A were allowed to B are allDon'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 thr computer until you_________ A were allowed to B are allDon'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 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 thr computer until you_________ A were allowed to B are allDon'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).

B主将从现be allowed todo 被允许