______such heavy loss ,the businessman didn't have the courage to go on.A:having suffered B:suffering C:to suffer D:suffered原因是什么啊?

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______such heavy loss ,the businessman didn't have the courage to go on.A:having suffered B:suffering C:to suffer D:suffered原因是什么啊?
______such heavy loss ,the businessman didn't have the courage to go on.
A:having suffered B:suffering C:to suffer D:suffered
原因是什么啊?

______such heavy loss ,the businessman didn't have the courage to go on.A:having suffered B:suffering C:to suffer D:suffered原因是什么啊?
选A,因为事情已经发生,所以要用完成时态.又因为是作为一个伴随情况来说名原因,所以用现在分词引导的短语.B的时态不对,C to suffer 不可以做伴随情况,D相当于被动语态,语态不对