--- Excuse me, can you tell me the way to the bank?
---Oh, that's , it's either the second or the third road on the left.
A. the difficult one
B. a hard one
C. an easy one
D. the very one
网友回答
A. the difficult one
B. a hard one
C. an easy one
D. the very one
解析：考交际用法。“that's a hard one”的意思是“这可难说了；这可是个难题”。