问题描述:
___from heart trouble for years,Professor White has to take some medicine with him wherever he goes.
a.Suffered
b.Suffering
c.Having suffered
d.Being suffered
请问这题是考什么知识点的?选哪个?请说明理由.
a.Suffered
b.Suffering
c.Having suffered
d.Being suffered
请问这题是考什么知识点的?选哪个?请说明理由.
问题解答:
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