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What we used to think ______ impossible...

 What we used to think ______ impossible now does seem possible.

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

 

 B. 解析:本题考查考生对于主谓一致和事态的使用能力。由used to可以看出应用过去时,在主语从句中what是主语,所以谓语动词用单数。
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