it was not untill eleven o'clock ___he went to bed.A in which B at which C when D that为什么不选D

问题描述:

it was not untill eleven o'clock ___he went to bed.
A in which B at which C when D that
为什么不选D

答案错

如果选D的话应该是It was not untill at eleven o'clock
没at就要用when