Smoking and drinking will----- A do your harm B.be harm to y

do harm to sb =do sb harm 伤害某人
come to harm 身体上或精神上受到损害,一般用于否定句
do more harm than good 利大于弊
形容词harmful
be harmful to .
这题应该是选C,详解↓
■do sb harm的用法
该结构表示“对某人有害”,其中的 harm 为不可数名词.如：
Smoking does harm to your health.吸烟对你的身体有害.
A few late nights never did anyone any harm.熬几个晚上的夜对人绝无害处.
Whether it will do us harm remains to be seen.是否对我们有害还要看一看.
注：也可说成 do harm to sb.如
Such books do great harm to young people.=Such books do young people great harm.那样的书对年青人危害很大.