The new mayor is certainly more progressive than her predecessor, but she is not nearly as efficient.
(A) but she is not nearly as efficient
(B) but she, however, is not nearly as efficient
(C) but she is nearly not as efficient
(D) even though she is not nearly as efficient
(E) despite being not as efficient
OA is later after some discuss. My confuse here is that can I use "although" with the existence of comma preceding it when place "although clause" in the second part.
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