题目内容
________ from heart trouble for years,Professor White has to take some medicine with him wherever he goes.
A.Suffered B.Suffering C.Having suffered D.Being suffered
C
【解析】suffer与Professor White构成主动关系,故排除A、D;又因两个动作有明显的先后顺序,故用完成时,答案应选C项。
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