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。
21．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
22．－Can I have a copy of Longman English Learners' Dictionary?
－Sorry, but there is left at the moment.
A．no one B．nothing C．none D．neither
