______the atmosphere around our Earth, we would not be able to live.A、Had it not

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问题 ______the atmosphere around our Earth, we would not be able to live.

选项 A、Had it not been for
B、Would it not be for
C、If it has not been for
D、If it were not for

答案 D

解析这是一道语法题，考点是虚拟语气的用法。

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