____the window, my finger was seriously cut.    [ ]

A. Having cleaned    

B. To clean    

C. While cleaning    

D. While I was cleaning

胃壁主细胞分泌的是（）

A.碱性黏液

B.促胃液素

C.胃蛋白酶

D.盐酸

E.抗贫血因子