_____ the clouds ,you would find the airplane in the sky easily.A Had it not been for B If it were not C If it had not been for D Were it not for选什么?为什么?

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_____ the clouds ,you would find the airplane in the sky easily.
A Had it not been for B If it were not
C If it had not been for D Were it not for
选什么?为什么?

句子意思为:“要不是因为有云,你很容易会看到天上的飞机.”
以现在事实相反,所以用were+V原,if引导的条件状语从句可以省略.
were it not for=if it were not for
D

答案是D.这是对现在的虚拟,从B,D中选,要不是的表达是It were not for....

B