SAT句子修改
修改句子,如果认为原题正确请选A
（ For a snake,shedding their skin） up to eight times a year is
part of a natural process.
A.For a snake,shedding their skin
B.A snake’s shedding its skin
C.When a snake sheds its skin
D.To shed its skin,for snakes
（）里的事错误部分,正确选项为B,我明白是动名词做主语 ,但我有个疑问如果把原题中的谓语改正,即their改成its,是否原题就正确了?即为：对于蛇来说,一年退四次皮是正常的生理过程.