______ from heart trouble for many years, Professor Brown has to take some medicine with him wherever he goes.

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问题 ______ from heart trouble for many years, Professor Brown has to take some medicine with him wherever he goes.

选项 A、Suffered
B、Suffering
C、Having suffered
D、Being suffered

答案C

解析 “suffer from”是Professor Brown发出的动作，所以不应用被动语态，据此排除A、D，另外suffer from这一动作发生在过去持续到现在并可能一直持续下去，所以用完成时态。

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