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为什么once there _an old man and his two songs living in the vi

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为什么once there _an old man and his two songs living in the village选b A.is B.was C.are D.were
为什么once there _an old man and his two songs living in the vi
首先你要排除单复数,因为主语是an old man,一个老人,所以应该用单数,排除C ,D.然后你再看时态,once常常用于讲故事的开头,相当于once upon a time,意思是从前.由此不难看出应该用过去时,综上所述,答案为B