英语单选just when i was very busy this morning one of our

问题描述:

英语单选just when i was very busy this morning one of our
just when i was very busy this morning ,one of our neighbours _____come and chat with me
Ashould Bmust 为什么不用should should不是有竟然的意思吗

这个题选must,因为must在这里是表示“偏偏”,此时must可表示某事发生得不早不迟,就在某个当紧的时候,多指某些不受欢迎的事情的发生