But for water,it ____impossible to live in the earth a is b was c were d would be

But for water,it ____impossible to live in the earth a is b was c were d would be

题目
But for water,it ____impossible to live in the earth a is b was c were d would be
选哪个,为什么?
答案
D 如果没有水 就不可能在地球上生存 表示 假设 虚拟语气
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想找英语初三上学期的首字母填空练习……
英语翻译
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