一道关于动词时态的英语题。
Bythetimehewasten,Edisonalreadydidexperimentsinchemistry.中,为什么用alreadydid,而不用alreadyh...
By the time he was ten,Edison already did experiments in chemistry.
中,为什么用already did,而不用already had done? 展开
中,为什么用already did,而不用already had done? 展开
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