Q20:      Five years ago, as part of a plan to encourage citizens of Levaska to increase the amount of money they put into savings, Levaska’s government introduced special savings accounts in which up to $3,000 a year can be saved with no tax due on the interest unless money is withdrawn before the account holder reaches the age of sixty-five.  Millions of dollars have accumulated in the special accounts, so the government’s plan is obviously working.      
      Which of the following, if true, most seriously weakens the argument?             - A substantial number of Levaskans have withdrawn at least some
      of the money they had invested in the special accounts. - Workers in Levaska who already save money in long-term tax-free
      accounts that are offered through their workplace cannot take advantage of      the special savings accounts introduced by the government. - The rate at which interest earned on money deposited in regular
      savings accounts is taxed depends on the income bracket of the account      holder. - Many Levaskans who already had long-term savings have steadily
      been transferring those savings into the special accounts. - Many of the economists who now claim that the government’s plan
      has been successful criticized it when it was introduced.  答案是D,我选择的是A。可是为什么呢,还是不明白。 谢谢!
 
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