—Your colleague's spoken English is quite good, Amy.

— No wonder, as she              in the USA for two years.                  [ ]

A. worked

B. has been working

C. had worked

D. has worked

关于员工健康体检，下列说法不正确的是（）

A.所有的员工转岗前必须重新进行体检

B.新员工聘用前必须进行常规体检

C.食堂工作人员必须严格按照卫生防疫部门要求进行健康检查

D.退休前的员工必须进行常规体检