which can weak the conclusion

    A .Given rough enough wether,most ferry passengers will have same symptom of seasickness

    B. The clinical tests reported by the drug companies were conducted by the drug companies

    C.People who don't take anti-seasickness medications are just as likely to respont to a survey on seasickness as people who do

    D.the seasickness symptoms of the people who took anti-seasickness medication would have been more severe had they not taken the medications

C,D哪个正确啊,我觉得题的意思是:吃晕船药的人比没吃药的晕船多,结论没看懂,better off not taking 是最好吃还是不吃啊

D

虚拟语气， 如果晕船的人不吃药的话，晕船情况还会更糟（比吃了药更糟）

能帮我分析一下d的句子成分吗,还是没太看懂,还就结论那句,would be better off not take the medications,是什么意思啊

the seasickness symptoms of the people （symptoms 是主语）who took anti-seasickness medication （定语修饰people) would have been more severe （谓语）had they not taken the medications（虚拟语气，=if they had not taken the medications）

简化后是：

The symptoms would have been more severe,if they had not taken the medications.

would be better off not take the medications=would be better off if they do not take the medications.

如果他们不吃药会更好。