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—Whatareyoumailing,Tom?—Atextbookanewmethodofteachingphysics.Iwantmyfriendstotakealookatit.A.isbasedonB.basedonC.basinguponD.whichbasedupon

题目详情
—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
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答案和解析
B