What we used to think______impossible now does seem possible.

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

B


解析:

what we used to think是主語(yǔ)從句，其謂語(yǔ)動(dòng)詞要用單數(shù)形式。used to do sth.表示“過去做某事”，所以要用一般過去時(shí)。

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