.1.She were often heard ____ this song when she was happy.

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• .1.She were often heard ____ this song when she was happy.
• 英语翻译a bird was confined in a cage outside a window.she often sang at night when all other birds were asleep.one night a bat came.he asked the bird why she was silent by day and sang only at night.the bird answered,"last year when i was singing in the daytime ,a bird catcher heard my voice and caught me in his net,since then i have never sung bu day ."the bat replied ,"but it is useless to do this now that you have become a *er"then he flew away.快
• 英语翻译A bird was confined in a cage outside a window.She often sang at night when all other birds were asleep.One night a bat came.He asked the bird why she was silent by day and sang only at night.The bird answered,"Last year when I was singing in the daytime,a bird catcher heard my voice and caught me in his net.Since then I have never sung by day.''The bat replied,"But it is useless to do this now that you have become a *er.'' Then he hlew away.
• .1.She were often heard ____ this song when she was happy.1.She were often heard ____ this song when she was happy.a.sang b.singing c.sung d.to be singing
• 求m的取值范围,使方程X²—2X+m—1=0求下列问题
• 方程x²+y²-2x+4y+m=0表示一个圆,求m的取值范围.