关于thousand的选择题

题目

关于thousand的选择题
We have bought ___ desks for the children there,and ____ these children have been to our school.
A、several thousands of ,two thousands of
B、several thousand ,two thousand of
C、thousands of ,two thousand of
D、thousands of ,two thousand
但我觉得应该是A啊.有of的话,一定要加s的么.
后半部分注意有个these 是否要考虑一下呢？
代词前要加of吧？

答案

是c.
前面的thousands是虚指,所以加了of.
而后面的那个of是表示属于,也就是说那些孩子里面的两千个,所以有of.两个of是不同的.