in a minute ,.for a moment.,at once /的区别.急

in a minute ,.for a moment.,at once /的区别.急 in a moment ,at a moment ,on a moment ,for a moment 的区别 in a moment和in a minute just a moment和just a minute 的区别 for a moment ,in a moment ,at a momet,for the moment 的区别是什么? for a moment,at a moment, in a moment的区别是什么?谢谢 in a minute 和 at once 有什么区别 【急求】英语动脑筋：What comes twice in a moment,once in a minute and 是in a moment minute吗?能把in改为at吗?=at once right away吗 at the moment;for the moment;the moment;in a moment区别 for a moment和in a moment的区别~ what occurs once in a minute,twice in a moment,and not once A.at the moment B.the moment C.for the moment D.in a moment的