Thomas Edison ____ already ____ a chemistry lab for himself by the time he ____ ten.

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• Thomas Edison ____ already ____ a chemistry lab for himself by the time he ____ ten.A.has…built…was B.had…built…was C.would…build…was D.was…building…is
• Thomas Edison ____ already ____ a chemistry lab for himself by the time he ____ ten.
• 英语,过去完成时题目.1.They ___________ (be) to the Beijing Zoo five times by the end of last term.2.By the time he was ten,Edison __________ ( build) his own chemistry lab.3.-Would you like to have an egg - No,thanks.I _________ ( have ) one before you came here.4.She ___________ (visit) Austrelia three times before she was twelve.5.The house was dirty.They _______ ( not clean) it for weeks.6.Yesterday morning I ________ (cal) to Mr.Wang,but nobody answered.7.
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• 单句改错：1,All but was here just now.2,Although he is considered a great writer ,however his works
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