Now there are_______most common drugs being used
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Now there are_______most common drugs being used for more than forty years.
A. one
B. two
C. three
D. four
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答案：D
由最后一段“The four most common drugs used now are more than forty years old”可知，现在最常用的四种治疗结核病的药已有四十多年的历史了。所以要加大投资金额用于研发新药品。