问题
选择题
It was not until 1978_____ set free from the prison.
A．that the old professor was
B．did the old professor
C．was the old professor
D．that was the old professor
答案
答案：A
题目分析：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。