Question

He ___ back until the work _____ done. A.isn't;will be B.isn't;is C.won't be;will be D.won't be;

is

Answer 1

He ___ back until the work _____ done.
A.isn't;will be B.isn't;is C.won't be;will be D.won't be;
选D won't be; is
直到工作完成，他才会回来
not...until...引导时间状语从句，用一般现在时代替将来时

Answer 2

应该是：won't be.....is

He won't be back until the work is done.

Answer 3

D won't be; is

追问

不是主将从现吗？

追答

这就是主将从现啊
will not (一般将来时)； is(一般现在时)。