二、英语知识运用(共两节,满分45分) 第一节 单项填空(共15小题;每小题1分,满分15分) 从A.B.C.D四个选项中,选出可以填入空白处的最佳选项。并在答题卡上将该项的标号涂黑。 It was not until they came to the very spot______how serious the situation was. A.did they realize B.that they realized C.when they realized D.where did they realize