for quite a few days he had to go to hospital for further treatment.A. Being illB. Fal

问题补充：

for quite a few days， he had to go to hospital for further treatment.

A. Being ill

B. Falling ill

C. Having been ill

D. To be ill

答案：

A. Being ill

B. Falling ill

(答案→)C. Having been ill

D. To be ill

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