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虚拟语气11.D___the clouds,you would find the airplane in the sky

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虚拟语气
11.D___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
为什么不能用B?
虚拟语气11.D___the clouds,you would find the airplane in the sky
因为这是表将来时,所以不能用Be动词(只有表过去时用)
if的虚拟语气 很麻烦,建议买本语法书