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

 

A

【解析】

試題分析：考查時態(tài)。根據(jù)句中時間狀語By the time he was ten到他十歲的時候，可知用過去完成時。句意：愛迪生十歲時,已經(jīng)開始做化學實驗了。故A正確。

考點：考查時態(tài)

 

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