No sooner ________ the women's liberation movement moved from the sixties to the seventies ________ it saw the economic conditions for its demands evaporate.
句意：妇女解放运动刚从六十年代发展到七十年代，它需求的经济条件就消失了。no sooner…than 为固定短语，意为“一……就……”，引导时间状语从句，主句用过去完成时，“than”后面的从句用一般过去 时。因此，本题的正确答案为C。