______ from heart trouble for many years, Professor Brown has to take some medic

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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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