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

[  ]

A.is

B.was

C.has been

D.will be

答案:B
解析:

what引导主语从句,we used to think是插入语,从句谓语要用单数形式,并且used to表示“过去常常”,所以要用一般过去时。


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