Question

My grandma didn't go to sleep ________ I go back home.

1. A.
   where
2. B.
   until
3. C.
   as soon as
4. D.
   while

Answer 1

B
本题考查连词的用法。not... until...意思是“直到……才……”，其他三词均无此用法。故正确答案为B。句意为：我祖母直到我回家才睡觉。