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invented, discovered invented, invented discovered, discovered discovered, invented
is invented invented was invented
were invented invented was invented is invented
was invented has been invented is invented will be invented
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BRI和DRI BRI和PRI FRI和DRI FRI和PRI
A.were both invented was invented are both invented is invented
was：invented were；invented is；invented has；been invented
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is invented was invented has invented had invented
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was invented has been invented is invented will be invented
Englishman; England; English Englishman; English; England Englishmen; England; English Englishmen; English; England
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to be invented having been invented invented to have been invented
the cost of hiring professionals is high the Englishman is enthusiastic for working with his hands there are advertisements in ' do - it - yourself' magazines the Englishman feels that he must do some household jobs
game invented play invented match inventing match invented
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