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hirty minutes. C. The train has been at the train station for half an hour. D. The train got to the station half an hour ago. ( ) 4. A. The cat39。s legs are black. C. The cat is white. D. The cat is black and white. ( ) 5. A. He has bought a book for me. B. He has paid for a book. C. He has returned the book to me. D. He has given me a book. II. Listen to the sentences and choose the correct answer. Each sentence will be read only once. 聽(tīng)句子,選擇正確的答語(yǔ)。 ( ) 6. A. I did my homework. B. I was washing the clothes. C. I was hungry and tired. D. I am doing some cle