1. None of the attempts to specify the causes of crime explains why most of the people exposed to the alleged causes do not commit crimes and, conversely, why so many of those not so exposed have.

(A) have

(B) has

(C) shall

(D) do（D）

(E) could

不懂这道题考什么语法点，是什么语法现象，请解释，谢谢！

答案应该是D，这里do指代的是commit crimes，not so exposed 只是迷惑，和前面exposed to the alleged causes 对应而已

according“and,conversely", we can find that the clause“why most of the people exposed to the alleged causes do not commit crimes" and the clause“why so many of those not so exposed——”should be parallel. so we choose D: do, which refers to "commit crimes".

请问 ：None of the attempts （to specify the causes of crime ）explains why most of the people exposed to the alleged causes do not commit crimes and, conversely, why so many of those not so exposed have.

to do 短语修饰attempts，None of the attempts 的中心词是none，为什么后面的explain用单数？在google上查出一句Maybe none of them are terrorists.....是用的复数阿

弱弱的问一下，这句话的中文意思是什么