Mr Smith has cancer for two years but he is still working very hard.A. sufferedB. suffered

问题补充：

Mr Smith has cancer for two years but he is still working very hard.

A. suffered

B. suffered from

C. suffered by

D. suffering from

答案：

A. suffered

(答案→)B. suffered from

C. suffered by

D. suffering from

解析：词语辨析。根据时间状语for two years可知要用现在完成时态，排除D；suffer遭受痛苦，损害等；suffer from患某种疾病。句中宾语是cancer，癌症。所以选B。