I didn't ____ you are going to leave ____ 3 o'clock.a.find;until b.remember;before为什么不能选b?

I didn't ____ you are going to leave ____ 3 o'clock.a.find;until b.remember;before为什么不能选b?
I didn't ____ you are going to leave ____ 3 o'clock.a.find;until b.remember;before
为什么不能选b?

I didn't ____ you are going to leave ____ 3 o'clock.a.find;until b.remember;before为什么不能选b?
A和B主要看语境,如果用remember几乎不会用didn't,而是用don't

做这个题靠两点
一是翻译 选A时译为：知道三点我才发觉你要准备离开了
选B时译为：在三点之前我没记得你要准备离开
显然选A时更符合
二是until的固定用法：not...until... 直到...才...