癌变率较高的大肠病变是（）。

A.Peutz-Jeghers息肉

B.绒毛状腺瘤

C.增生性息肉

D.炎性息肉

E.幼年性息肉

I still remember the day _____ I first came to college.

A．on which

B．in which

C．which

D．that