单选题The top officer in B

问题补充：

单选题ThetopofficerinBeijingsaysthatallconstructionworkfortheBeijingOlympicby.A.has been completedB.has been completedC.will have been completedD.will have completed

答案：

C解析句子主语all construction work和 complete构成动宾关系，所以要用被动语态；再者，“by+将来时间”作状语时，句子要用将来完成时态。