这道题真让人头疼！

我的全家福

12.In the diurnal type of tidal oscillation, the alternate rise and fall of sea level, a single high water and a single low water occur __    tidal day.

(A)each

(B)each of

(C)each of the

(D)of each

答案给的是A,可我觉得A和C都对呀，不是有考点：each+of +the+n.吗？遇到这种情况我老是迷糊。

一个梦醒的人

each of +可数名词复数 所以c is not right

n9ga1

of + n  结构 前面需要限定词