最简单的：Nobody/noonecananswerthequestion.
其他：（There's）Nobody/nooneknowstheanswertothequestion.
Thereisn'tasinglepersonknowstheanswertothequestion.
Noneofthepeopleknowstheanswertothequestion.
Hardlydopeopleknowtheanswertothequestion.
Nobody/noonehasanyideatoanswerthequestion.
希望我的回答对你有帮助，谢谢。
