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?

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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?

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?
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?

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

b
将来完成时

C,By the time a child is five在他五岁的时候,表示过去。AB表将来,不对,D表示现在,不对。

将来完成时,所以选B
到孩子五岁时,他将已看了数百小时的电视.
By the time a child is five,到孩子5岁时,说明还没到,所以用将来时,CD都不对
A是将来时,但反映得到他那时已经看了数百小时的电视,所以选B

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