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英语单选求助,1,when she phoned i did not have much time to talk,be

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英语单选求助,
1,when she phoned i did not have much time to talk,because i (was leaving) for france in two hours.为什么要用was leaving?2,the mad man was put in the soft-padded cell lest he (injure) himself.为什么用(injure)?
【参考答案】
1、此处was leaving虽在形式上是过去进行时,但却表达将来意义
这是某些动词的特殊用法,即用进行时表达将来时意义,
英语中这类动词有go、leave等
2、此处injure是虚拟语气,其完整形式是would+动词原形,此处省略了would的,
由于前面有lest,所以本句使用该语气.