______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

问题描述:

______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

B. 现在分词表原因。

B

c
suffer 不及物
用完成式表示对现在的影响

c