-Hello,I didn't know you were here

问题描述:

-Hello,I didn't know you were here
-_______
A I'm so glad to see you
B Not at all
C Sorry,I don't know
D Yes,you're right
我一开始是选B的,因为Not at all是没关系的意思么,但答案是A,我觉得不太恰当~难道是口语的惯用语么?

因为你的话里没有“道歉”的意味,所以不用not at all.场景是你们是偶遇的,然后他就说“很高兴在这里遇见你”