According to the school rules,if a student _________ happen

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According to the school rules,if a student _________ happen to damage something by accident,he/she should report it to a teacher or the office immediately.
A.should B.will C.shall D.would
为什么会是A?
答：本题考查虚拟语气条件句的时态.
虚拟将来（指将来发生的可能性很小的情况）,if从句的谓语动词有三种形式:
1.过去式,如：If I had time,I would stuy French.
2.were to+V,如：If it were to snow tomorrow,we could ski.
3.should+ V,如：If it should snow tomorrow ,we would ski.
评：本题句设计有误.
虚拟语气的主句时态有两种形式：would +V （对现在和将来情况的假设）和would have done (对过去情况的假设）,其中would一词,表示“会.”主语如果是第一人称,则可以换作should,意思不变,如：If I had time,I should study French.如果我有时间,我就会学法语.
也可以根据意思而用could(能够）和might(可能）和用should(应该）的情况很少见到.
学生不小心损坏公物,这不是“万一”的事,而是很有可能的事情,不应用虚拟语气,而应用真实条件句：if a student happens to damage sth.by accident,he/she should report it to ...

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