请问 question 前用 a.an.some?那个?

请问 question 前用 a.an.some?那个? 请问那些单词前加a ,an 外语:a few some question a cereal an cereal some cereal 那个正确 在下列名词前加上a,an,some 用a,an,some填 请问"an open-ended question"是什么意思? some question Any question?A Some B Yes 请问何时名词前加An,何时加A? 请问 high school student前加a还是an 英语填空,用a,an,some,any