for a long time, but he tried his best to make up for what he missed.
A. Being ill staying in hospital
B. Having been ill staying in hospital
C. To be ill staying in hospital
D. He was ill staying in hospital
网友回答
A. Being ill staying in hospital
B. Having been ill staying in hospital
C. To be ill staying in hospital
(答案→)D. He was ill staying in hospital
解析：句意：他生病住院很长时间了，但是他尽自己最大的努力弥补他错过的。句子中含有but，连接两个句子，选D。