-----Hi, Nancy, I didn’t know you had come back. So have you graduated from college?

---- Yes. I _____ French for 5 years in Nanjing.

A．have studied

B．studied

C．had studied

D．am studying

下列叩诊音在正常人体身上无法叩及的是（）

A.清音

B.过清音

C.鼓音

D.实音

E.浊音