this kind of pen was invented (by a boy named tom)对括号部分提问() this kind of pen ()()()?

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this kind of pen was invented (by a boy named tom)对括号部分提问() this kind of pen ()()()?

this kind of pen was invented (by a boy named tom)对括号部分提问() this kind of pen ()()()?
this kind of pen was invented (by a boy named tom)
对括号部分提问
() this kind of pen ()()()?

this kind of pen was invented (by a boy named tom)对括号部分提问() this kind of pen ()()()?
By whom was this kind of pen invented?
(Whom) this kind of pen (was)(invented)(by)?

Who was this kind of pen invented by?

Who was invented by