All I can say is,go there,go now,apologize on your knees．Ask what you ________ possibly do to make u

All I can say is,go there,go now,apologize on your knees．Ask what you ________ possibly do to make up for it．

A.could

B.will

C.must

D.should

答案及解析： A

解析：

possibly常与can或could连用，用来加强语气。