一道英语单选题,帮忙翻译并简析,不胜感激
问题描述：
一道英语单选题,帮忙翻译并简析,不胜感激
A conductor was invited to keep us_____in the singing at the School Art Festival.
A.in common B.in advance C.in time D.in return
答
A conductor was invited to keep us_____in the singing at the School Art Festival
B.in advance
提前作好准备
A.in common（通常） C.in time （准时,按时赶到）D.in return（回报）