There are about teachers and students in their school.A. three thousandsB. three thousand

问题补充：

There are about teachers and students in their school.

A. three thousands

B. three thousand

C. thousand of

D. three thousand of

答案：

A. three thousands

(答案→)B. three thousand

C. thousand of

D. three thousand of

解析：英语中数词表示概数时，后面加s，和介词of搭配使用。用原形时表示具体数字和数词搭配使用。句意：在他们学校大约有三百老师。结合语境可知本句表示具体数字，故选B。