摘要: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

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