◎ 题干
What we used to think _____ impossible now does seem possible.  
[     ]

A. is                
B. was              
C. has been      
D. will be

◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“What we used to think_____ impossible now does seem possible.[ ]A. isB. was C. has beenD. will be…”主要考查了你对  【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。