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 arealso aggravating
答案是A，但想问一下A中的 not only do damage by themselves but also aggravate中的do 是什么个用法？直接not only damage不行吗？作者: suners 时间: 2011-5-6 13:14
