We all know that drinking too much our health, but some people don’t care.
A. is harm to
B. does harmful to
C. is harmful to
D. do harm to
网友回答
A. is harm to
B. does harmful to
(答案→)C. is harmful to
D. do harm to
解析：考察harm的用法。Do harm to =be harmful to 对……有害，该句主语是drinking too much,单数，所以选择C
句意为，我们都知道饮酒过多对我们的健康有害，但是很多人不在乎。