前用介词in,例如:

1、In my best time, I am not with you.在我最美好的时间,我最喜欢的人也不在我身边。

2、Moreover, the current writing situation of social dramas is in its best time, and meanwhile, there are some problems.当下社会戏剧的创作正处在最好时期,但也存在不少问题。