【单选题】
Asrecentlyas1950,tuberculosiswasnevercurableunlesssequesteredinsanitariums;today,thedrugIsoniazidhasmadesuchtreatmentobsolete.()
(A)unlesssequestered
(B)withoutsequestering
(C)withoutbeingsequestered
(D)unlessitwassequestered
(E)unlesspatientsweresequestered
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