问题
选择题
—What are you mailing, Tom?
— A textbook a new method of teaching physics. I want my friends to take a look at it.
A．is based on
B．based on
C．basing upon
D．which based upon
答案
答案：B
题目分析：句意：上文，你在邮寄什么？下文，一本以新的物理教学方法为基础的教科书，我想让我的朋友看一下。动词短语base on与其逻辑主语A textbook是被动关系，故用过去分词作定语，选B。