—-I’m sorry but I’m afraid I must be off now. — Mr Smith. And have a nice day!A. So l

问题补充：

—-I’m sorry , but I’m afraid I must be off now.

— , Mr Smith. And have a nice day!

A. So long

B. So much

C. So well

D. So far

答案：

(答案→)A. So long

B. So much

C. So well

D. So far

解析： 短语辨析. A.再见 B.这么多 C.这么好 D. 目前.句意:对不起,恐怕我现在必须得走了.——再见，史密斯先生，祝你度过美好的一天！选A。