是a user还是 an user?为什么?

是a user还是 an user?为什么? User user=Session["user"] as User It is no user 后面为什么要接 动名词短语?是固定的用法还是能通过语法分析出来? an owner's [user's] manual user中文翻译 ${USER.u_name } user是什么意思 user profile user是什么 end user 计算机英语选择题7.A user interface we said here is _____.A.an intera An attempt to create a new user failed as the chosen email a