Do you know Betty very well?Yes,she and I____friends since we met in He fei last summer?A：have made B：had become C：have been,说一下理由,

Do you know Betty very well?Yes,she and I____friends since we met in He fei last summer?A：have made B：had become C：have been,说一下理由,
Do you know Betty very well?Yes,she and I____friends since we met in He fei last summer?
A：have made B：had become C：have been,说一下理由,

Do you know Betty very well?Yes,she and I____friends since we met in He fei last summer?A：have made B：had become C：have been,说一下理由,
一般完成时……很好很强大,我鸭梨很大……
最后应该是句号吧
made是主观性的,而这是两个人互相的
B把had弄成have可以
C正确答案（become在这里等于been）