To be frank I really don’t know what SOS . Can you explain it?A. stands byB. stands forC.

问题补充：

To be frank, I really don’t know what SOS . Can you explain it?

A. stands by

B. stands for

C. stands up

D. stands with

答案：

A. stands by

(答案→)B. stands for

C. stands up

D. stands with

解析：可联系答.案.网客服索取。