【题目】Miss Lee didn't notice little Tom slide out of the classroom; she ________ something on the blackboard.
A.was writing
B.wrote
C.had written
D.has written

【答案】A
【解析】句意：李小姐没有注意到小汤姆悄悄溜出了教室；李小姐刚才正在黑板上写东西。小汤姆是趁李小姐正在黑板上写东西的时候溜出教室，所以用过去进行时，表示在过去某一时间段或某一段时间内正在发生或进行的动作或状态。所以答案是A。