Doctors generally agree that such factors as cigarette smoking, eating rich foods high in fats, and alcohol consumption not only do damage by themselves but also aggravate genetic predispositions toward certain diseases.
(A) not only do damage by themselves but also aggravate
(B) do damage by themselves but also are aggravating to
(C) are damaging by themselves but also are aggravating
(D) not only do damage by themselves, they are also aggravating to
(E) are doing damage by themselves, and they are also aggravating
题目分析：原文中用not only but also形成了一个并列关系，A not only后面用do，but also用aggravate都用的是原形，留着。B前面用do 但是后面用are aggravating前后不对应，C
前后都用ing，对应，留着。D和E前后都不对应，A和D一个一般现在时一个进行时态，这句话说的是一个客观情况，不能用进行时态，干掉D，选A
