this kind of pen was invented (by a boy named tom)

this kind of pen was invented (by a boy named tom)
对括号部分提问
() this kind of pen ()()()?
英语人气:626 ℃时间:2019-12-13 04:23:00
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By whom was this kind of pen invented?
(Whom) this kind of pen (was)(invented)(by)?
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