--Is your mother at home?          

--No. She_     shopping.               [ ]

A. has been to                

B. goes                

C. has gone                

D. has been in

如果发生紧急情况，监理工程师认为将造成人员伤亡，或危及本工程或邻近的财产须立即采取行动，监理工程师有权在未征得业主的批准的情况下发布处理紧急情况所必须的指令，承包人应予执行。( )