OG11-67,关于if do, do的用法

67.   Defense attorneys have occasionally argued that their clients’ misconduct stemmed from a reaction to something ingested, but in attributing criminal or delinquent behavior to some food allergy, the perpetrators are in effect told that they are not responsible for their actions.

(A) in attributing criminal or delinquent behavior to some food allergy

(B) if criminal or delinquent behavior is attributed to an allergy to some food

(C) in attributing behavior that is criminal or delinquent to an allergy to some food

(D) if some food allergy is attributed as the cause of criminal or delinquent behavior

(E) in attributing a food allergy as the cause of criminal or delinquent behavior

此题也是OG10的21题.正确答案是B.

我的问题主要集中在if上,我知道if do, will do 和if did, would do.

但此处做为条件句,if do, do是怎么回事? 这种用法适用于什么场合呢?

搜索了很多以前的帖子,但是找不到关于这一点的详细说明.

困惑中,请NN指教,谢谢

if do, do,if do, will do都可以

if did, would