Question

I had too much work to do last night . I didn ' t go to bed       11 o' clock .
A. in           B.until       C. for.

Answer 1

B.

in 指的是在……内部。not … until 意思是：“直到……才”，until后跟表示时间的名词时，until是介词，“直到……为止”，for “为了”，故B 。