问题补充：
．, we would not have achieved so much.
A. If they didn’t help us
B. If it hadn’t been their help
C. Weren’t it for their help
D. Had it not been for their help
答案：
A. If they didn’t help us
B. If it hadn’t been their help
C. Weren’t it for their help
(答案→)D. Had it not been for their help
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