问题描述：
英语句式解析："had it not been for the diamonds"前面是否需要连词?it指代什么?
原句：The reasearch has been underway in southern Africa for four years now,and it problably wouldn't have happened there had it not been for the diamonds.
原句：The reasearch has been underway in southern Africa for four years now,and it problably wouldn't have happened there had it not been for the diamonds.
问题解答：
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