22. As recently as 1950, tuberculosis was never curable unless sequestered in sanitariums; today, the drug Isoniazid has made such treatment obsolete. (A) unless sequestered (B) without sequestering (C) without being sequestered (D) unless it was sequestered (E) unless patients were sequestered
以下是引用荷叶田田在2007-12-22 21:16:00的发言: 22. As recently as 1950, tuberculosis was never curable unless sequestered in sanitariums; today, the drug Isoniazid has made such treatment obsolete. (A) unless sequestered (B) without sequestering (C) without being sequestered (D) unless it was sequestered (E) unless patients were sequestered