If it was thought carefully,it will have been done better.为什么要用was thought和has been done?

If it was thought carefully,it will have been done better.为什么要用was thought和has been done?

题目
If it was thought carefully,it will have been done better.为什么要用was thought和has been done?
不是问为什么要用被动语态 是为什么用was和has been
答案
这句话的翻译是 如果它被仔细的考虑过的话 它将会被做的更好
was thought是因为它是被动语态 后一句是虚拟语气 表示与将来事实可能相反
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