作业帮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
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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
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
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
【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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C. was, learned
选B。这是一道时态题。到他十岁时，他已学会了3000英语单词。他十岁是过去的事，因此用一般过去时，在那之前的事用过去完成时。
B
建议参考charlie 254