may i speak to peggy this is ___speaking

问题描述:

may i speak to peggy this is ___speaking
A she B her C she's D Peggy's
为什么呢 还是D 选择不应该有‘S?

答案A.
主句是this is she,speaking是修饰she的.
如果D没有's是可以的.有's的话就有两个动词了呀,当然不可以.