—How many students are there in your school?
— students, I think.
A. Three thousands
B. Three thousand
C.Three thousands of
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解析：此题考查名词的量。确切数量常用数词+hundred/thousand/million/billion+名词的复数形式；不确切数量常用hundreds/thousands/millions/billions + of+名词的复数形式.根据语境可知选择B。