All the essays _____________, the teacher sent the students home.

A．having written and collected

B．having been written and collected

C．being written and collected

D．to be written and collected

转岗人员可在保留原岗位技术等级的基础上，申报新岗位的技术等级，但需从新岗位的“初级”开始申报。（）

A、初级

B、中级

C、高级

D、与原岗位相同的等级