Had not been for his help,we could not have succeeded.
翻译:
要不是他的帮助，我们是不可能成功的。
知识点解析:
虚拟语气（倒装）。原句应为 If it had not been for his help…，表示与过去事实相反的假设。省略 if 后，将助动词 Had 提前构成部分倒装。