If the plane mh370had arrived on time there ? So much sadness with us
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这句话应该填wouldn't have been。这是与过去事实相反的虚拟语气条件句。
表示与过去事实相反的虚拟语气，要把时态往前推一格，从句要用过去完成时，主句可以用would加上have再加过去分词，即过去将来完成时，如：
If I had known you had a problem, I would have brought my tools.
What would you have done if I hadn't arrived?
I would have asked her to mend it.
表示与过去事实相反的虚拟语气，要把时态往前推一格，从句要用过去完成时，主句可以用would加上have再加过去分词，即过去将来完成时，如：
If I had known you had a problem, I would have brought my tools.
What would you have done if I hadn't arrived?
I would have asked her to mend it.
本回答由科学教育分类达人 章斌推荐
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