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
选哪个,为什么?
英语人气:658 ℃时间:2020-02-05 12:45:05
优质解答
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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