--Is your mother at home?          

--No. She_     shopping.               [ ]

A. has been to                

B. goes                

C. has gone                

D. has been in

注水站场地地坪设计标高，应高于站外自然地坪（）以上。

A、0.lm

B、0.5m

C、1.0m

D、1.2m