By the time he was ten,Edison experiments in chemistry. A.had already done B.already h——青夏教育精英家教网—

摘要：By the time he was ten,Edison experiments in chemistry. A.had already done B.already had done C.was already doing D.already did

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By the time he was ten,Edison______experiments in chemistry.

A.had already done　　　　 B.already had done

C.was already doing　　　　 D.already did

By the time he was ten, Edison ________ experiments in chemistry．

had already done

already had done

was already doing

already did

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