The school rule states that no child shall be, unless______by an adult, allowed out of the school during the day.

A.was accompanied

B.accompanying

C.accompanied

D.being accompanied

答案及解析： C

解析：

考查从句的省略式：unless accompanied=unless the child is accompanied by an adult，句意是：学校规定说，没有孩子在没有成人的陪伴下可以在白天出学校。选C。