_ from liver failure ,the Canadian actress had to receive treatment in the hosptial.A suffered B suffering C having suffered D being suffered这个题选C,为什么A不对呢?Since Mark graduated from college at a very young age ,I think he _ a very

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_ from liver failure ,the Canadian actress had to receive treatment in the hosptial.A suffered B suffering C having suffered D being suffered这个题选C,为什么A不对呢?Since Mark graduated from college at a very young age ,I think he _ a very

_ from liver failure ,the Canadian actress had to receive treatment in the hosptial.A suffered B suffering C having suffered D being suffered这个题选C,为什么A不对呢?Since Mark graduated from college at a very young age ,I think he _ a very
_ from liver failure ,the Canadian actress had to receive treatment in the hosptial.
A suffered B suffering C having suffered D being suffered
这个题选C,为什么A不对呢?
Since Mark graduated from college at a very young age ,I think he _ a very intelligent boy then.
A would have been B must be C would be D must have been
这个题选D ,C为啥不行
希望解答可以完整些,如果好,

_ from liver failure ,the Canadian actress had to receive treatment in the hosptial.A suffered B suffering C having suffered D being suffered这个题选C,为什么A不对呢?Since Mark graduated from college at a very young age ,I think he _ a very
C suffer动作发生在receive treatment之前,用现在分词的完成式,过去分词suffered表是主语与动作suffer为被动关系,所以不对
D must have been为对过去的肯定推测,从句意看显然符合,would be不能表推测