if和unless的用法1.If you _____(be)happy,we ____(be)happy.2.Jack_
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1.If you _are____(be)happy,we _are___(be)happy.2.Jack_missed__(miss)the early bus if he _couldn't__ get_(not get) up early3.Plastic __will melt_(melt)if it __gets_(get)too hot.4.If you go across the b...

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