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初中英语1.Today the forests have almost gone.People must_____dow

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初中英语
1.Today the forests have almost gone.People must_____down too many trees.
A.stop from cutting B.stop to cut C.be stopped from cutting
D.be stopped to cut
2.There are two new buildings near the sea, and______of them are very tall.
A.none B.all C.neither D.both
3.Willie will learn swimming,no matter how much it______.
A.costs B.takes C.spends D.pays
最好告诉我为什么,第2个为什么不选A或C
第一题选A,意思是人们必须停止砍树
第二题选D,记主,两者用both 三者和以上用all
第三题选A. 因为有这样的用法. 物cost钱. spend用法是 人spend 时间on sth. pay 用法是人pay 钱for sth. 所以主语是物的话,用cost.