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Luckily ______ to be no one un

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Luckily ______ to be no one under the tree when it broke down. A. it happened B. there happened C. there used D. it had 老师,我只看到过it happened that / to do / to be,可这题的答案是B,有there happened……的句式吗?如果有的话,是什么意思呢?请老师详细讲解一下~
解题思路: 这是 There be 结构的一种变形。 There be 结构表示“存在”
解题过程:
Luckily ______ to be no one under the tree when it broke down.
A. it happened B. there happened C. there used D. it had
老师,我只看到过it happened that / to do / to be,可这题的答案是B,请问老师有there happened……的句式吗?如果有的话,是什么意思呢?请老师详细讲解一下~
没有there happened……的句式
这是 There be 结构的一种变形。
There be 结构表示“存在”
There is a book on the desk.
There happened to be 碰巧存在某种现象
Luckily _there happened _____ to be no one under the tree when it broke down.
当它掉下来时,幸好树下没人。
另外类似的还有There used to be 过去存在
There used to be a big tree in front of the house.
以前房子前面有棵大树。
最终答案:略