—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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—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 |