It was not until 1978______ set free from the prison.A.that the old professor wasB.did the old professorC.was the old professorD.that was the old professor
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A解析试题分析：句义：直到1978年那个老教授才被从监狱释放。It was ……that 构成强调句型排除B； C D语序不对，因为not until位于句首构成倒装用于强调句型不倒装。所以A正确。
考点：考查强调句型和倒装的用法。