请教新东方语法教程练习3的两道题

14.Of the thousands of varieties of bird species in North Americ,_____bright red plumage, like the cardinal, are most often designated as state bird.

(A) those that have

(B) who have

(C) which have

(D) to have their

答案是A，做同位语吗？可是选C的话which have bright red plumage不是可以做非限制性定语从句吗？我不理解为什么C错了，而A对。请各位大大赐教。

38.Observation of the Sun, Moon, and stars has enabled humans to determine both the seasons and the time from day.

答案是D。不明白，应该怎么改呢？

those是主语that havebright red plumage是定语从句

which have bright red plumage不是可以做非限制性定语从句吗？NO，否则没有主语。

from---in.我个人认为。请大家参考

never heard of "time in day", don't you?

time of day

有道理。谢谢！