选择题There are _____ of studengs in our school,but only______o

关于thousand两道选择题
There are _______ of students in our school but only _____ of them are girls.
答案是：thousands, two thousand
In our city, ___ middle school students want to work as a teacher in the future.
A. thousand B. thousand of C. thousands of D. two thousand of
答案是C,thousands of,而为什么不能是 D. two thousand of,从语法上应该是没错的啊.

选择题
There are _____ days in a week.
A.a B.six C.seven D.不填
Please take it _____ .
A.home B.to home C.to there D.here

一道选择题
there are________students in my school.
A.five thousand
B.five thousands
C.five thousand of
D.five thousands of
为什么