题目内容
14.-Look,there is a lot of rubbish in the river.-Yes,people say that 80per cent of fish in this river ______ live long.( )
| A. | doesn't | B. | don't | C. | isn't | D. | aren't |
分析 --看,河里有很多垃圾.
--是的,人们说这条河里有百分之80的鱼活不长.
解答 答案:B.考查否定句.句意"--看,河里有很多垃圾.--是的,人们说这条河里有百分之80的鱼活不长.".live是实义动词,否定句不用be动词,因此C,D不正确.fish是"鱼",它的单复数同形,所以百分之八十的鱼应该是复数,故助动词应该用don't.A不正确.答案是B.
点评 考查否定句.通常是在be动词,情态动词后加not.一般现在时态,主语不是第三人称单数用don't,主语是第三人称单数用doesn't.一般过去时态用didn't.还有其它用法需要牢记.
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