heart disease for many years,he had to take medicine everywhere.
A. Having suffered from
B. Have suffered from
C. To suffer from
D. Suffering
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(答案→)A. Having suffered from
B. Have suffered from
C. To suffer from
D. Suffering
解析：本题考查suffer from的用法“患……病”，同时由句中时间状语知需用现在分词完成式。