题目内容：

-How many students are there in your school?- ,I think.But I don't know the exact number.
A.Thousand B.Thousands of C.Thousands D.Hundreds or thousands

优质解答

答案是B.thousands of 数千人,其中的of不能省略.
如果用A,就说 one thousand 一千人
如果用D,就说hundreds of thousands of 数以十万计