What are you mailing,Linda?

题目

What are you mailing,Linda?
-----A textbook_____a new method of teaching physics.I want my friend to take a look at it.
A.is based on B.based on C.basing on D.which based upon
为什么选B,不是应该是be based on

答案

您好,很高兴为您What are you mailing, Linda?琳达,你在邮寄什么?-----A textbook_____a new method of teaching physics. I want my friend to take a look at it.一本关于物理教学新方法的书（这只是短语,而非一句...