常用in、on、at作介词开头的词组答:期间), in December, in due course(及时地), in future, in good season(及时地), in no time(马上), in one’s childhood, in one’s spare time, in one’s teens, in one’s youth, in recent years, in season(适时), in seconds(在很短的时间), in some cases(有时候), in...