东北农业大学网络教育学院 大学体验英语第二册作业题作业题（一）Part II Vocabulary and Structure (20 minutes)Directions: There are 30 incomplete sentences in this part. For each sentence there are four choices marked A),B),C) and D) Choose the ONE answer that best completes the sentence. Then mark the corresponding letter on the Answer Sheet with a single line through the centre.1.Until then, his family _D_ from him for six months. A)didnt hear B)hasnt been hearing C)hasnt heard D)hadnt heard
