How come you didn’t tell me about this before?和How come they left you alone here!怎么理解这两个句

问题描述:

How come you didn’t tell me about this before?和How come they left you alone here!怎么理解这两个句

How come = Why
How come you didn’t tell me about this before?
你之前怎么没告诉我这个?
和How come they left you alone here!
他们为什么把你一个人扔在这儿!