Slice plain cake and place in bottom of glass 8-inch square dish. Mix 1/2 cup boiling water with gelatin. When dissolved, pour over cake. Drain juice from crushed pineapple and reserve and place pineapple over cake and gelatin. Combine pineapple juice with enough milk to equal 2 cups and mix with instant pudding. Pour over cake, gelatin and pineapple. Slice bananas, covering top. Place whipped topping over bananas and spread to cover entire trifle.
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