____for a long time,but he managed to catch up with his classmates at last.A.Having been ill B.Being ill C.He was ill D.Though ill

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____for a long time,but he managed to catch up with his classmates at last.
A.Having been ill B.Being ill C.He was ill D.Though ill

选C
后面BUT引导的是从句,前面需要一个主句

c