may i speak to Mary?___________.A.yes,you must.B.no,you needn't C.this is Mary speaking.

问题描述:

may i speak to Mary?___________.A.yes,you must.B.no,you needn't C.this is Mary speaking.
选什么?为什么?

This is Mary speaking.
你打电话 找Mary.对方回答:A.是 你必须.B.不,你不必.C.我就是Mary
从逻辑关系理解,只有C正确