16、 Laszlo Biro is considered ____ the ball point pen.

A. to invent                                        B. inventing  

C. to be inventing                               D. to have invented

16、D  

 

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 Laszlo Biro is considered ____ the ball point pen.

A. to invent                                        B. inventing  

C. to be inventing                               D. to have invented

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