百度作业网By the time he ______ ten, he ______ about 3,000 English wor
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By the time he ______ ten, he ______ about 3,000 English words.
A. had been, had learned B. was, had been C. was, learned D. had been, learned
A. had been, had learned B. was, had been C. was, learned D. had been, learned
【答案】B. was, had been
【解析】by the time 1)到…时候为止
通常引导一个时间状语从句,表示“到……的时候为止”主句则表示在此时间之前某个事件已完成.值得注意的是,当从句用【过去时】时,主句通常用【过去完成时】.
例如： By the time l got to the station,the train had already gone
主句：he had been about 3,000 English words【过去完成时】
从句：By the time he was ten【过去时】
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【解析】by the time 1)到…时候为止
通常引导一个时间状语从句,表示“到……的时候为止”主句则表示在此时间之前某个事件已完成.值得注意的是,当从句用【过去时】时,主句通常用【过去完成时】.
例如： By the time l got to the station,the train had already gone
主句：he had been about 3,000 English words【过去完成时】
从句：By the time he was ten【过去时】
学习进步~若觉得满意~请记得采纳~∩_∩
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