A.whichB.thatC.whatDwhethersomeresearcherbelievethatthereisnodoubt---acureforAIDSwillbefound.theplaybroughtthescenebacktomymindhowiwaslookedafterbythevillagers.A.howB.whenC,whichD.that

问题：A.whichB.thatC.whatDwhethersomeresearcherbelievethatthereisnodoubt---acureforAIDSwillbefound.theplaybroughtthescenebacktomymindhowiwaslookedafterbythevillagers.A.howB.whenC,whichD.that

答案：↓↓↓

高桦的回答：

网友采纳　　选Dthat.　　Thereisnodoubtthat+从句（‘从句’即一完整句子）：毫无疑问……　　此为一固定搭配,就是说讲英语的国家的人们都很习惯用这个大家都知道的固定方法去交流.