—  ______ those students Chinese, do you have to speak their language very often?

— No, they learn most when the class is taught in a foreign language. [ ]

A. To teach

B. Taught

C. Having taught

D. As to teach

未经批准在电力设施周围进行危及电力设施安全的作业，由()责令停止作业。

A.安全管理部门 

B.电力管理部门 

C.施工管理部门 

D.当地人民政府