He said that not until the heavy snow blocked the express how serious the weather was.
A. did the tourists realize
B. the tourists realized
C. the tourists did realize
D. didn’t the tourists realize
网友回答
(答案→)A. did the tourists realize
B. the tourists realized
C. the tourists did realize
D. didn’t the tourists realize
解析：考查倒装，not until位于句首，所以用不完全倒装，助动词提前，句子意思“他说游客们没有意识到天气怎么严重直到大雪阻挡了他们的快车”