We were( )giving up( )they came to help us out.

问题描述:

We were( )giving up( )they came to help us out.
A.at the point of;when
B.on the point of;when
C.on the point of;while
D.about to;when

B.on the point of;when
正要/即将……的时候/ 在...之际;正要
She was on the point of going out when the telephone rang.
她正要出去,电话铃响了