摘要： ---What are you mailing, Tom? ---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 on
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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
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