A) suffered B ) suffer C) suffering D) to suffer

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A) suffered

B ) suffer

C) suffering

D) to suffer

参考答案:

CC[试题分析]词形的选择。[详细解答]根据句意,因为suffer与前文逻辑主语一致,这里应接现在分词短语对前文进行修饰,故答案为C。