John received an invitation to dinner, and with his work ____, he gladly accepted it. [ ]

A. finished

B. finishing

C. having finished

D. was finished

根据传染病防治法，SARS的管理应( )

A．各省级卫生管理机构自行决定
B．各级医疗机构自行决定
C．按乙类管理
D．按甲类管理
E．按丙类管理