the higher income tax is harmful( )it may discourage people from trying to earn more

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• the higher income tax is harmful( )it may discourage people from trying to earn more
• the higher income tax is harmful( )it may discourage people from trying to earn moreA so that B in that 难道不是结果状语从句?请详解
• the high income tax is harmful------it may discourage people from trying to earn more
• the high income tax is harmful------it may discourage people from trying to earn moreA in that B that C which D which A 跟B 怎么区别,在什么情况下用B 什么情况下用A 答案肯定是A
• 已知数列an满足a1+2a2+2^2a3+...+2^n-1an=2^2n-1(n∈N*)1.求数列an的通项公式2.设bn=(2/3)nan,求数列bn的前n项和Sn.
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