B C D
who is they? pronoum error
the cause is not known, unknown too is ..
The cause of Osgood’s syndrome is unknown, nor is it known why the disease appears to be increasing
in the United States.
(A) unknown, nor is it known
(B) unknown, neither do they know
(C) not known, nor do they know
(D) not known, unknown too is
(E) not known, neither do they know
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