the clouds you would find the airplane in the sky easilyA. Had it not been forB. If it we

问题补充：

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

答案：

A. Had it not been for

B. If it were not

C. If it had not been for

(答案→)D. Were it not for

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