They usually do some office work weekdays.

问题描述:

They usually do some office work weekdays.
A.in \x05B.on \x05C.at \x05D.both B and C

选D
解析:on weekends 和at weekends都是在周末的意思,他们唯一的区别只是一个是美国说法,一个是英国说法,意思都一样,都对
翻译:他们经常在周末办公