Question

— I suppose I’ll have to ask someone else to see me off .

    — I’m afraid so . I would see you off if I      ,but I       .

A. would ; won’t     B. could ; can’t   C. might ; needn’t    D. should ; mustn’t

Answer 1

B 

解析:

前一空用 could 构成虚拟语气，第二空用can’t 表示事实