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B. at C. in D. on 2. lovely piglets. A. What a B. What C. How a D. How 3. cute they are! A. How B. How a C. What D. What a 4. mum is a dog. A. They’re B. They are C. Their D. I’m baby dog a puppy. A. are called B. called C. is called 四 、改錯 。 1. Their playing together.