______from heart trouble for years,Professsor Wang has to take some medicine with him wherever he:Suffered B:Suffering C:Having suffered D:Being suffered

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______fromhearttroubleforyears,ProfesssorWanghastotakesomemedicinewithhimwhereverhe:SufferedB:Suffer

______from heart trouble for years,Professsor Wang has to take some medicine with him wherever he:Suffered B:Suffering C:Having suffered D:Being suffered
______from heart trouble for years,Professsor Wang has to take some medicine with him wherever he
:Suffered
B:Suffering
C:Having suffered
D:Being suffered

______from heart trouble for years,Professsor Wang has to take some medicine with him wherever he:Suffered B:Suffering C:Having suffered D:Being suffered
c
suffer 不及物
用完成式表示对现在的影响

c

B

B. 现在分词表原因。