To this day, researchers and theorists debate whether bubonic plague caused The Black Death, a pandemic that swept the world in the middle of the fourteenth century.
(A) whether
(B) whether or not
(C) about whether
(D) as to whether
(E) if
OA A
Source: Manhattan Prep
To this day, researchers and theorists debate whether bubonic plague caused The Black Death, a pandemic that swept the
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