8.By the time a child is five,he _______ hundreds of hours o

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8.By the time a child is five,he _______ hundreds of hours of television.
A.will watch B.will have watched C.had watched D.is watching
为什么答案选B?

答案为B 从句意分析,当一个孩子涨到五岁的时候,他就会看过了数百部电视剧
从语法结构分析,当局中出现by the time ,so far等短语时,主句用完成时态,即have done; 若时间状语从句中时态为现在时,则主句用将来完成时（例如,本题）,若时间状语从句中时态为过去式,则主句用过去完成时
再问：就用完成时的句子是没有带从句的时候吗？
再答：当然有带从句的时候，如时间状语从句~~~ I will have finished the essay by the time you offer me one. 有不懂得还可以再问我哈

8.By the time a child is five,he _______ hundreds of hours o by the time of five与 by five o‘clock一样吗 he has o _______ a child The airport is within five hours'flying time of half the wor 划分句子成分,The airport is within five hours'flying time of half 英语翻译The airport is within five hours' flying time of half th by the time you arrive this evening,_______ for two hours.a The short one is by far _______ expensive of the five. The next train is in_______(five hours)time. He had been a doctor for five years by the time he ____from 5.He is often made ____for twelve hours a day by the boss. A He insisted on -----the experiment hundreds of times A.doing