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两个很简单的英语填空不会做

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两个很简单的英语填空不会做
The examiner must have been pleased.He ________pleased.
A.was probably B.should be
为什么答案是A should 表示推测 为什么 B 不对?
Let us suppose that a child suddenly crosses the road.Imagine it ________
A.happening B.will have happened
为什么答案是A Imagine it will have happened 中“it will have happened”从句作imagine的宾语 为什么不对?
两个很简单的英语填空不会做
1.must have been done
表说话人对过去发生的事"推测"..."一定..."
The examiner must have been pleased
检查人士(当时)一定很开心...
表说话人主观的意像...可能examiner (当时)不开心也不一定.
而 should be 是"shall be '的过去时,表"将要,本应该"..
2.happening是 it were /was happening的省略
这题是考虚拟语气...
就如:i wish i were living here
我希望我住在这.(我并不住这,只是我想象的,希望的某种状态)
i suppose you were playing the piano.
而 it will have happened表示的则完全不同/..它是指"注定未来会发生的""未来会被完成的事"
如:the building will have built next year.
这楼明年会被竣工...
it will have happened是现在的某些"迹象"让说话者"肯定"谋事未来一定会发生///
而这句"让我们假设一个小孩子突然过马路",只是一种假设,而非对未来会发生的事的"迹象"或者"依据".