Question

Until you’ve finished your work, you___allowed to leave. A. will be B. will not be C. will have b

Until you’ve finished your work, you___allowed to leave. A. will be B. will not be C. will have been D. are 答案是B，求详解

Answer 1

选a
not
until等这些含有否定意义的词组为了强调作为状语放在句首时，句子应该倒装。
改成正常语序则是：
you
can
not
leave
until
your
work
is
finished.

Answer 2

B
until引导的是
时间状语从句
。时间状语从句与主句有一个“
主将从现
”的原则。此题的从句是
现在完成时
，故可断定主句是
一般将来时
。所以排除C、D。
又根据句意，这是“not...until..."(直到……才……），故排除A。