–I’m sorry but I must be going off now.Ok .A. So longB. Walk slowlyC. Be carefulD. Tak

问题补充：

–I’m sorry but I must be going off now. --Ok, .

A. So long

B. Walk slowly

C. Be careful

D. Take your time

答案：

(答案→)A. So long

B. Walk slowly

C. Be careful

D. Take your time

解析：考查交际用语，So long.“再见”。