问题补充：
I heard that he for three days. Do you know if he is better now?
A. fell ill
B. had fallen ill
C. was ill
D. had been ill
答案：
A. fell ill
B. had fallen ill
C. was ill
(答案→)D. had been ill
解析：考查时态：句意：我听说他病了三天了你知道现在他是否好多了。可知病了三天是在听说以前发生的，是过去的过去，用过去完成时，和一段时间连用不能用短暂动词，要用延续性动词：be ill，选D。
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