When are you going to help me with my Maths?

问题描述:

When are you going to help me with my Maths?
A.in May 3rd B.In Saturday morning C.At 7:00 in the evening D.On October

C.At 7:00 in the evening
在某一天应该用on,如A B.
没具体到某一天,应用in,如D
在几点钟,用at 如C