()of the students must wear school uniforms when they are at school A.All B.none C.most

问题描述:

()of the students must wear school uniforms when they are at school A.All B.none C.most

选a . all

由语法加句子意思应该选A因为students是复数排除B由常识句意思应该是在学校是每个人都要穿校服