By the time he was ten, Edison experiments in chemistry.A. had already done B. already had doneC. was already doing D. already did 题目和参考答案——青夏教育精英家教网—

题目内容

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

【解析】

试题分析：考查时态。根据句中时间状语By the time he was ten到他十岁的时候，可知用过去完成时。句意：爱迪生十岁时,已经开始做化学实验了。故A正确。

考点：考查时态

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