请问：02-01 -12

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

答案选a，c为什么不对阿？each 和all of the...many of the...区别？谢谢～

each + N.单数

all of the + N.复数，many of the 也是一样的道理

嗯，谢谢。。

c选项不对是不是因为 each of the tidal day 比 each tidal day 罗嗦？

each of the + N.复数＊＊＊之中的每一个，若后还是单数，就没有之中了吧